pKa = - log Ka - pKa = log Ka 10 - (pKa) = Ka Ka = 10 - (pKa) Consider the reactions below. Thus Ka = 10-pKa. How to Determine pH From pKa | Sciencing New version of unit converters is available. Let's solve an example to understand this calculator. Pka to ka online calculator | Math Tutor Converting for example [H+] to pH seems pretty simple, but I always have a hard time doing vice versa, especially with non-whole number pH values. Alternatively, it can be used to find the pOH value of a base by. Given that relationship between Ka and pKa is defined logarithmically, we can rewrite the equation from the previous step as Ka = 10^- (pKa). By raising 10 to the power of -pKa, we can calculate the acid dissociation constant. You can get math help online by visiting websites like Khan Academy or Mathway. Formula to calculate Ka from pKa. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. -log(Ka). pKa is the criterion used to determine the acidity of the molecule. Find Ka. This widget finds the pH of an acid from its pKa value and concentration. Determine math To determine math equations, one could use a variety of methods, such as trial and error, looking for patterns, or using algebra. When given the pH value of a solution, solving for \(K_a\) requires the following steps: Calculate the \(K_a\) value of a 0.2 M aqueous solution of propionic acid (\(\ce{CH3CH2CO2H}\)) with a pH of 4.88. If you buy through links on our site, we may earn a commission. Example 1. pKa of an acid is 4.75 and 0.1 concentrated in a solution. If you don't take the negative log and instead take the positive log, then you'll be working with negative numbers constantly. This image may not be used by other entities without the express written consent of wikiHow, Inc.
\n<\/p>

\n<\/p><\/div>"}, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/1\/16\/Find-Ka-from-Pka-Step-10.jpg\/v4-460px-Find-Ka-from-Pka-Step-10.jpg","bigUrl":"\/images\/thumb\/1\/16\/Find-Ka-from-Pka-Step-10.jpg\/v4-728px-Find-Ka-from-Pka-Step-10.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"