
Concept explainers
Interpretation:
Using the given pH of a weak acid, the value of Ka has to be found.
Concept Introduction:
The acid which can dissociate only one proton is known as weak acid. It can be represented as HA.
The pH of the monoprotic acid can be determined as follows:
Step 1: Using the ICE table, determine the equilibrium concentrations of all the chemical species involved in the dissociation of the monoprotic acid.
Step 2: In the ICE table, the change in concentration is the concentration of the H+ ion that has to be determined from the pH of the weak monoprotic acid as follows:
pH = − log10 [H+][H+] = 10-pH
Step 3: Substitute the equilibrium concentrations in the expression for the acid dissociation constant Ka.
Step 4: The value of Ka can be obtained by evaluating the expression of Ka.

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Chapter 15 Solutions
Chemistry
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