Here is a $0.200 M$ solution of$H_3C_6H_5O_7$
(citric acid, $K_a$ $=$ $3.5 \cdot 10^{-4}$)
Hydrolysis equilibrium:
$H_3C_6H_5O_7$ $ +$ $H_2O$
$H_3O^+$ $+$ $H_2C_6H_5O_7^-$
What are the changes in concentration of each species?
a) +x M, -x M, +x M b) -x M, +x M, +x M c) +x M, +x M, +x M d) -x M, +x M, -x M
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The answer b) is correct, because for each mole of acid which dissociates, one mole of each of the ions is formed.