Acetic acid has a ka 1.8x10^-5. How many grams of NAC2H3O2 would have to be added to 100ml of 0.1M HC2H3O2 to prepare a buffer with a PH of 4.5 g?

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Ответ:

mervindavisk

07.09.2021

Chemistry

Solution :

H_2CO_3 is considered a diprotic acid.

Sp it can dissociate in solution by giving two protons.

Chemical equations for the first step of carbonic acid is :

First ionization

$H_2CO_3(aq) + H_0(1) \rightleftharpoons H_.O^+(aq) + HCO_3^-(aq)$

Equilibrium constant expression is

$K_{a}_{1}=\frac{[H_3O^+][HCO_3^-]}{[H_2CO_3]}$

Second ionization -

$HCO_3^-(aq) + H_2O(l) \rightleftharpoons H_3O^+(aq) + CO_3^{2-}(aq)$

Equilibrium constant expression is

$K_{a2}=\frac{[H_3O^+][CO_3^{2-}]}{[HCO_3^-]}$

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