$pH$ of weak acids

Tutorial 2

    

Here is a 0.200 M solution of $ H_3C_6H_5O_7 $ (citric acid, $K_a$ $=$ $3.5 \cdot 10^{-4}$) Hydrolysis equilibrium: $H_3C_6H_5O_7$ $+$ $H_2O$ $H_3O^+$ $+$ $H_2C_6H_5O_7^-$ Identify the initial concentrations of the three species present at equilibrium (without $H_2O$):

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a) 0.200M, 0M, 0.200M b) 0M, 0.200M, 0.200M c) 0.200M, 0M, 0M d) 0.200M, 0.200M, 0.200M

The correct answer is: Initial concentrations: c) 0.200M, 0M, 0M