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Answer : The concentration of benzoic acid in this solution was, 0.149 M
Explanation :
The balanced equilibrium reaction will be,
initially conc. c 0 0
At eqm. c(1-α) cα cα
The expression for dissociation constant is:
when α is very very small the, the expression will be,
Given:
α = 2.05 % = 0.0205
Now put all the given values in this expression, we get:
c = 0.149 M
Therefore, the concentration of benzoic acid in this solution was, 0.149 M