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How do you get a Pka?

How do you get a Pka?

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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How do you get a Pka? 

Expert Solution
Step 1

Dissociation constant (Ka) is the equilibrium constant of a reaction which depicts the dissociation of a proton from a weak acid. 

For example, a weak acid i.e. HA dissociates as per following reaction:

HA  + H2O <-----> H3O+ + A-

The Ka of above reaction can be written as:

 

[Н:0'JA] К. [НA]
Step 2

pKa  stands for the negative logarithm (to base 10) of Ka . 

Mathematically, it is written as pKa  = -log (Ka ).

So, to calculate pKa  , negative logarithm of Ka  is to be calculated.

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