Concept explainers
Interpretation:
The correct equation for the dissociation of nitrous acid needs to be determined.
Concept introduction:
For an equilibrium reaction as follows:
The expression for equilibrium constant is as follows:
Here,
Answer to Problem 15STP
Option (a)
Explanation of Solution
From the given table, it can be seen that the concentration of HNO2 at the starting of reaction is 1.0 M and after the reaction it becomes 0.97 M. Also, the concentration of both H+ and NO2- is 0.023 M. This indicates that HNO2 does not completely dissociate into hydrogen ion and NO2-ion. Thus, it is a weak acid.
For a weak acid, dissociation reaction is represented as follows:
Thus, the dissociation reaction of HNO2 will be:
Thus, correct option is (a).
Chapter U6 Solutions
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