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 equilibrium concentrations of each species?
a) 0.200 M, x M, (0.200-x) M b) 0 M, 0.200 M, 0.200 M c) (0.200-x) M, x M, (0.200+x) M d) (0.200-x) M, x M, x M
For answers, use (possibly several times) the arrows ↑ Down! and ↓ Up! Complete please this question before moving on to the next one!
Answer d) is correct, $(0.200$ $ -$ $x)$ $M$, $0$ $+$ $ x$ $=$ $x$ $M$, $0$ $+$ $x$ $=$ $x$ $M$.