Best of all, Pka to ka online calculator is free to use, so there's no reason not to give it a try! The pKa to pH converter calculator is an online tool that can find the pH of a liquid solution using the pKa value and concentration. math is the study of numbers, shapes, and patterns. It really helps a lot with my homework, even though you have to pay it's worth it and it tells you the steps also. Ka to pka calculator - The correct formula is Ka=10-pKa K a = 10 - p K a . pKa is defined as the negative logarithm (-log) of Ka, which means you calculate . If Ka is 7.1E-7, pKa is just 7 - log7.1. Vocabulary and. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. 00:0000:00 An unknown error has occurred Brought to you by eHow Theoretically, this reaction can happen in both directions. var tr_already_opted_out = "You already opted out from selling your personal information"; Ka from pka calculator - The value of Ka will be = 1.778 x 10^-5. It makes calculating logs a lot simpler. It is so easy to use and always gets the answer right, Although. When we write logab=c , we specify, Greatest weakness examples for job interview, Pearson education 5th grade math worksheet answers, Solving equations by elimination method with 3 variables, The modern period class 8 questions and answers. If you already know the pKa value for acid and you need the Ka value, you find it by taking the antilog. Can I find Ka (or pKa) without a calculator? For maintaining the precise and accurate pH of the buffer solution follow the steps Input: Select the buffer type Enter the pKa Enter Acid or base concentration Enter Relative salt concentration Although pH is formally defined in terms of activities, it is often estimated using free proton or hydronium concentration: \[ pH \approx -\log[H_3O^+] \label{eq1}\]. Christopher Osborne has been a wikiHow Content Creator since 2015. pKa calculator. hard time doing vice versa, especially with non-whole number pH values. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. In other words, a low pKa indicates a strong acid and vice versa. Include your email address to get a message when this question is answered. 2023 Leaf Group Ltd. / Leaf Group Media, All Rights Reserved. If you already know the pKa value for acid and you need the Ka value, you find it by taking the antilog. It is used in everyday life, from counting to measuring to more complex calculations. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Substitute your known pKa value into the equation from the previous step. Set the new equation equal to the given Ka \[2 \times 10^{-9} = \dfrac{(x)(x)}{(0.2 - x)}\] . Remember that pKa is expressed as a common logarithm (base 10) and not as a natural logarithm (base e), so you want to find a table or select a function on your calculator that raises the number to a power of 10 rather than a power of e. Chris Deziel holds a Bachelor's degree in physics and a Master's degree in Humanities, He has taught science, math and English at the university level, both in his native Canada and in Japan. Alternatively, it can be used to find the pOH value of a base by. Find things in a picture game with answers, How to find the length of the median of a right triangle, How to solve an integral when both limits are trigonometric, How to write greater than or equal to in python, Linear speed calculator inches per minute, Ncert solutions class 6 maths exercise 5.6, Top behavioral interview questions and answers. I offer private online MCAT tutoring. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2023 wikiHow, Inc. All rights reserved. If you already know the pKa value for acid and you need the Ka value, you find it by taking the antilog. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Grab a free copy of my ebook \"MCAT Exam Strategy - A 6 Week Guide To Crushing The MCAT\" at https://leah4sci.com/MCATguideYTThis video is part 9 in my MCAT Math Without a Calculator video series. How do you calculate a Ka value from pKa? You can get to just about any number from 2 and 3. Given that relationship between Ka and pKa is defined logarithmically, we can rewrite the equation from the previous step as Ka = 10^- (pKa). The site owner may have set restrictions that prevent you from accessing the site. Plug all concentrations into the equation for \(K_a\) and solve. For example, log8 is just log2+log2+log2 = 0.3*3. log9 = log3+log3. This operation gives you the dissociation constant Ka: When Ka is large, it means the conjugate ions aren't strong enough to move the reaction in the opposite direction, which indicates a strong acid. Your estimate of Ka is 10.8, while the actual answer is 10.63. This app has helped in countless tests/homeworks. Thus Ka = 10-pKa. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Doing math equations is a great way to keep your mind sharp and improve your problem-solving skills. I love thissssss. To convert the Ka value of 7.1 * 10^-7 to the pKa value with no calculator, do we just assume that the power is approximately equivalent to the pKa? Based on this Ka and the equation given above. Solution: We are given the pK_a for butyric acid and asked to calculate the K_b and the pK_b for its conjugate base, the butyrate ion. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. The formula for converting pKa to Ka is as follows: Ka = 10^-pKa. Learn more Ka (Ka{\displaystyle K_{a}})the acid dissociation constanttells you the strength of an acid in a different and more specific way than the better-known pH. Tips. Solve for the concentration of H 3O + using the equation for pH: [H3O +] = 10 pH Use the concentration of H 3O + to solve for the concentrations of the other products and reactants. Mathematics is the study of numbers, patterns, and relationships. This video also demonstrates the log trick by showing you how to solve an OH- concentration to pH question. If Ka is 7.1E-7, pKa is just 7 - log7.1. I can solve any questions using it and it's work like a tutor , it teaches every minute details about a mathematical Problem. Catch the entire MCAT Math series on my website here: http://leah4sci.com/mcat-math-without-a-calculator/Need more help? Find pH. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. When the solvent is water, it's left out of the equation. If you need help with tasks around the house, consider hiring a professional to get the job done quickly and efficiently. \[ \ce{CH_3CH_2CO_2H + H_2O \leftrightharpoons H_3O^+ + CH_3CH_2CO_2^- } \nonumber\], According to the definition of pH (Equation \ref{eq1}), \[\begin{align*} -pH = \log[H_3O^+] &= -4.88 \\[4pt] [H_3O^+] &= 10^{-4.88} \\[4pt] &= 1.32 \times 10^{-5} \\[4pt] &= x \end{align*}\], According to the definition of \(K_a\) (Equation \ref{eq3}, \[\begin{align*} K_a &= \dfrac{[H_3O^+][CH_3CH_2CO_2^-]}{[CH_3CH_2CO_2H]} \\[4pt] &= \dfrac{x^2}{0.2 - x} \\[4pt] &= \dfrac{(1.32 \times 10^{-5})^2}{0.2 - 1.32 \times 10^{-5}} \\[4pt] &= 8.69 \times 10^{-10} \end{align*}\]. =>K_a=10^-(pK_a) pK_a=-log_10K_a =>-pK_a=log_10K_a =>10^-(pK_a)=K_a =>K_a=10^-(pK_a) 50935 views around the world You can reuse this answer Creative Commons License Understanding Ka and pKa Ka = [H+][A-]/ [HA] pKa = - log Ka at half the equivalence point, pH = pKa = -log Ka. How do you calculate the pKa to Ka and vice versa in your head? Almost all of the acids you work with in organic chemistry have a Ka that takes the form a*10^-b, where a is a positive real number and b is a non-negative integer. If you already know. When we write log_ab = c, we specify that a^c =b. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2023 wikiHow, Inc. All rights reserved. Quick ka to kb conversion, pOH WITHOUT an ICE TABLE, and convert from pOH to pH. This article was co-authored by wikiHow staff writer, Christopher M. Osborne, PhD. So to ease that, pKa came into existence. The dissociation constant for a strong acid can be as high as 10^7 while for a weak acid it can be as low as 10^-12. To convert Ka into pKa, get out your calculator and find -log . Use the relationships pK = log K and K = 10pK (Equation 16.5.11 and Equation 16.5.13) to convert between K_a and pK_a or K_b and pK_b. If you're struggling with a math problem, scanning it for key information can help you solve it more quickly. If you're looking for an answer to your question, our expert instructors are . -log(Ka). His writing covers science, math and home improvement and design, as well as religion and the oriental healing arts. etc. Example 1. pKa of an acid is 4.75 and 0.1 concentrated in a solution. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Math can be tough, but with a little practice, anyone can master it! wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Math Tutor. How do you calculate Ka from pKa? The calculator takes. HA (aq) + H 2 O (l) H 3 O + (aq) + A - ( aq) Ka = [A - ] [H 3 O +] / [HA] We can calculate the Keq (equilibrium constant) or Ka of a reversible acid-base reaction. pKa is defined as the negative logarithm (-log) of Ka . The dissociation constant value for strong acid is as high as 10 7, while for weak acid, it is as low as 10 -12, which is quite tricky to remember. When the solvent is water, this is written as: It's possible to determine this strength of the original acid by dividing the concentrations of the conjugate acid and base by the concentrations of the original acid and base. The mathematical operation you perform is Ka = antilog (-pKa). This article has been viewed 2,824 times. General Chemistry:Principles & Modern Applications; Ninth Edition, Pearson/Prentice Hall; Upper Saddle River, New Jersey 07. Ka = 10 - (pKa). This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2023 wikiHow, Inc. All rights reserved. pKa=. Take some tips from us and learn How to get pka from ka. Therefore to convert pKa to Ka just find 10^ -pKa in the scientific calculator, you will get it. We are not permitting internet traffic to Byjus website from countries within European Union at this time. Then use the fact that the ratio of [A ] to [HA} = 1/10 = 0.1 pH = 4.75 + log 10 (0.1) = 4.75 + (1) = 3.75 This means that at pH lower than acetic acid's pKa, less than half will be dissociated, or ionized; at higher pH values, more than half will be ionized. You can also find it on a scientific calculator by inputting the number and pressing the exponent key, which either looks like a hat (^) or is denoted by 10x. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Besides being easier to work with, pKa values have an inverse relationship to acid strength. If all of this is twisting your brain a little, heres some good news: its actually pretty easy to figure out Ka from pKa (or pKa from Ka) with a scientific calculator, or to get a decent estimate without a calculator. You can measure the strength of an acid by its dissociation constant K a, which is a ratio formed by dividing the concentration of products by the concentration of reactants: K a = [H30+] [A-]/ [HA] All the reactions happen in water, so it it's usually deleted from the equation. Solved Example. . This will give . hard time doing vice versa, especially with non-whole number pH values. http://leah4sci.com/MCAT Presents: MCAT Math Without A Calculator Video 9 - Solving MCAT antilog calculations without a calculatorWatch Next: Logarithms an. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2023 wikiHow, Inc. All rights reserved. http://leah4sci.com/MCAT Presents: MCAT Math Without A Calculator Video 8 - Solving MCAT logarithm calculations without a calculatorWatch Next: Logarithms . Do you need help with your math homework? The correct formula is Ka=10-pKa K a = 10 - p K a . and without app I'd be struggling really badly. Math which you MUST be able to complete quickly and confidently without a . Find the pH of this solution. This widget finds the pH of an acid from its pKa value and concentration. pKa from Ka or Molarity . Extended Keyboard. To create a more manageable number, chemists define the pKa value as the negative logarithm of the Ka value: pKa = -log Ka. Alternatively, it can be used to find the pOH value of a base by inputting its pKb value in the "pKa=" input field. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. How to Convert pKa to Ka. [2] 2 When citing the strength of an acid, chemists often use the dissociation constant, Ka, but this number can vary by several orders of magnitude from one acid to another. Almost never get ads, always helps. How to Evaluate Trig Functions Without a Calculator There are a few ways to calculate trigonometric functions without a calculator. 1.Use the equation Ka=10-pKa{\displaystyle Ka=10^{-pKa}} for this conversion. How to find pka from ka without calculator - To create a more manageable number, chemists define the pKa value as the negative logarithm of the Ka value: pKa = . This widget finds the pH of an acid from its pKa value and concentration. Formula to calculate Ka from pKa. Step 2: Enter the numerical quantities into the formula. Please add it to were it answers long word problems. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. For the Change in Concentration box, we . And well show you how to do it all! Solving instead for Ka requires you to raise both sides of the equation by exponents of 10: [1] For this example, we'll say (which is in fact the pKa for plain water). + Example 1.Use the equation Ka=10-pKa{\displaystyle Ka=10^{-pKa}} for this conversion. I get sick alot so I have alot of math homework. pH of acid by pKa. For example, if pKa = 3.26, then Ka = 10^-3.26. Whether you need help solving quadratic equations, inspiration for the upcoming science fair or the latest update on a major storm, Sciencing is here to help. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. You can work on whatever task interests you the most. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2023 wikiHow, Inc. All rights reserved. As: pH = pKa + log([A]/[HA]) So, The calculator uses this formula to . pK_a = -log_10K_a. Because Ka produces extremely wide-ranging values, pKa (pKa{\displaystyle pK_{a}})the negative logarithm (base 10) of Kais often used to simplify the range of acid strength values. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2023 wikiHow, Inc. All rights reserved. I use this to help my children in their studies. Use the equation for this conversion. The calculator takes, Applications of triple integrals in engineering, Find the fourier series for the extended function, The table shows the outcomes of rolling two number cubes, Ullu web series watch online free dailymotion, What is the meaning of prime factors in maths. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. The lesser the pKa is, the molecule would hold proton less tightly; hence the more potent the acid will be. Key points For conjugate-acid base pairs, the acid dissociation constant K_\text {a} K a and base ionization constant K_\text {b} K b are related by the following equations: K_\text {a}\cdot K_\text {b}=K_\text {w} K a K b = K w When given the pH value of a solution, solving for Ka requires the following steps: Set up an ICE table for the chemical reaction. As a result of the EUs General Data Protection Regulation (GDPR). Paige Norberg (UCD) and Gabriela Mastro (UCD). You solve this by raising both sides of the original relationship to powers of 10 to get: Ka = 10 (-pKa) By signing up you are agreeing to receive emails according to our privacy policy. Solve for the concentration of \(\ce{H3O^{+}}\) using the equation for pH: \[ [H_3O^+] = 10^{-pH} \]. Purdue University: Brnsted Acids and Bases, Khan Academy Organic Chemistry: Ka and pKa Derivation. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/5\/5c\/Find-Ka-from-Pka-Step-7.jpg\/v4-460px-Find-Ka-from-Pka-Step-7.jpg","bigUrl":"\/images\/thumb\/5\/5c\/Find-Ka-from-Pka-Step-7.jpg\/v4-728px-Find-Ka-from-Pka-Step-7.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"

\u00a9 2023 wikiHow, Inc. All rights reserved. Few of them are enlisted below. pKa is defined as the negative logarithm (-log) of Ka, which means you calculate. Use Math Input Mode to directly enter textbook math notation. He began writing online in 2010, offering information in scientific, cultural and practical topics. How to Find Ka from pKa: Plus pKa to Ka & 5 Sample Problems To create a more manageable number, chemists define the pKa value as the negative logarithm of the Ka value: pKa = -log Ka. Let's solve an example to understand this calculator. How to convert between Ka and pKa (or Kb and pKb) Engineer4Free 173K subscribers 95K views 9 years ago Chemistry Check out http://www.engineer4free.com for more free engineering tutorials and. pKa, Ka, and Acid Strength. No tracking or performance measurement cookies were served with this page. So for this example we would approximate the pKa to be about 7? This is so much faster than looking all over the internet to find an answer to compare to, it may not work on word problems but this does work for any type of number problem. This will give you your answer. without app I would have to work 5-6 hours tryna find the answer and show work but when I use this I finish my homework in 30 minutes or so, the camera caption has improved overtime . Till i found this. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. In some tables, you may find the pKa value listed, but you may need the Ka value to plug into your equations. Chemistry Tutorial: How to convert between Ka and pKa (or Kb and MCAT Math Vid 9 - Antilogs in pH and pKa Without A Calculator. The mathematical operation you perform is Ka = antilog (-pKa). This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Pka to ka online calculator - Math can be a challenging subject for many students. Video 7 - pH/pOH [H+]/[OH-] Wheel . var tr_would_you_like_to_opt_out = "Would you like to opt out from selling your personal informaion for the purpose of ads personalization? 1. Expert teachers will give you an answer in real-time. Deriving Ka from pH I would like to give 100 stars for the helpul activities by this app, i hated that I had to pay at first but I realized that these services don't come cheap, and one more addition, maybe a dark mode can be added in the application. Try it. How to Convert Ka to pKa, Formula, Equation & Examples of. To create a more manageable number, chemists define the pKa value as the negative logarithm of the Ka value: pKa = -log Ka. \[ HA + H_2O \leftrightharpoons H_3O^+ + A^- \], \[ K_a = \dfrac{[H_3O^+][A^-]}{[HA]} \label{eq3} \]. MedPR said: Yeah. [A] - Concentration of conjugate base and pKa = -log(Ka). http://leah4sci.com/MCAT Presents: MCAT Math Without A Calculator Video 9 - Solving MCAT antilog calculations without a calculatorWatch Next: Logarithms and Antilogs https://youtu.be/Pn4cp-ai_C8Is your MCAT just around the corner? Thus K a is the antilogarithm of the negative of pK a. K a = antilog (-pK a) The logarithm of a number x is the exponent that the number 10 should be raised, to obtain x. Better than Photomath. New version of unit converters is available. For those who struggle with math, equations can seem like an impossible task. (10-6) 9.4. . You solve this by raising both sides of the original relationship to powers of 10 to get: When pKa is a whole number, such as -7, this operation is easy to perform, but when it contains a fraction, such as 7.5, you may have to look up the value in a table. The numerical value of \(K_a\) is used to predict the extent of acid dissociation. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2023 wikiHow, Inc. All rights reserved. pKa = - log Ka - pKa = log Ka 10 - (pKa) = Ka Ka = 10 - (pKa) Consider the reactions below. { Acid_and_Base_Strength : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", Calculating_A_Ka_Value_From_A_Measured_Ph : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", Calculating_Equilibrium_Concentrations : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", Fundamentals_of_Ionization_Constants : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", Weak_Acids_and_Bases : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", Weak_Acids_and_Bases_1 : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()" }, { Acid : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", Acids_and_Bases_in_Aqueous_Solutions : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", Acid_and_Base_Indicators : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", Acid_Base_Reactions : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", Acid_Base_Titrations : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", Buffers : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", Buffers_II : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", Ionization_Constants : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", Monoprotic_Versus_Polyprotic_Acids_And_Bases : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()" }, [ "article:topic", "pH", "Ionization Constants", "showtoc:no", "license:ccbyncsa", "licenseversion:40" ], https://chem.libretexts.org/@app/auth/3/login?returnto=https%3A%2F%2Fchem.libretexts.org%2FBookshelves%2FPhysical_and_Theoretical_Chemistry_Textbook_Maps%2FSupplemental_Modules_(Physical_and_Theoretical_Chemistry)%2FAcids_and_Bases%2FIonization_Constants%2FCalculating_A_Ka_Value_From_A_Measured_Ph, \( \newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}}}\) \( \newcommand{\vecd}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash{#1}}} \)\(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\) \(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\)\(\newcommand{\AA}{\unicode[.8,0]{x212B}}\), status page at https://status.libretexts.org. Video 6 - Auto Ionization of Water in MCAT Acid Base Chemistry. This video teaches you how to tackle anti-log questions as they arise on your MCAT, without the use of a calculator. To create a more manageable number, chemists define the pKa value as the negative logarithm of the Ka value: pKa = -log Ka. Solutions with low pH are the most acidic, and solutions with high pH are most basic. In the Bronsted-Lowry formulation of acids in solution, the acid donates a proton and the solution accepts one. Sign up for wikiHow's weekly email newsletter. WebQC is a web application with a mission to provide best-in-class chemistry tools and information to chemists and students. We use cookies to make wikiHow great. Explanation: Remember your definitions for logarithmic functions. If you're looking for a quick delivery, look no further than our company. Pka to ka calculator - Pka to ka calculator is a software program that supports students solve math problems. The quantity pH, or "power of hydrogen," is a numerical representation of the acidity or basicity of a solution. We know that. Converting From pKa to Ka The conversion of pKa to Ka is given below.