If the pKa of water is 15.7 and the pKa of HF is 3.2, which is the stronger base, OH or –F? -F -OH

Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter14: Acids And Bases
Section: Chapter Questions
Problem 15QRT
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If the pKa of water is 15.7 and the pKa of HF is 3.2, which is the stronger base, ¬OH or –F?
O-F
O-OH
Transcribed Image Text:If the pKa of water is 15.7 and the pKa of HF is 3.2, which is the stronger base, ¬OH or –F? O-F O-OH
Expert Solution
Step 1

Dissociation of a weak acid is given by:

HA    H+  +  A-

The acid dissociation constant of this acid is given by:

Ka =  H+ A-HA

For the strong acid, the value of Ka will be greater than the weak acid. The negative logarithm of the Ka is known as pKa. The pKa of an acid is given by:

pKa = -log Ka

Due to the negative logarithm, the pKa value of a strong acid is less than a weak acid.

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