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explain the buffer mechanism in terms of the common-ion effect when strong acid HCl and base...

explain the buffer mechanism in terms of the common-ion effect when strong acid HCl and base NaOH are added to the acetic/ sodium acetate buffer solution

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acetic acid is weak acid it can establish equilibrium in between dissocaited and undissociated part

CH3COOH <-----------------> CH3COO -    + H+

sodium acetate is strong electrolyte it will compltely dissociates into ions

CH3COONa -----------------------------> CH3COO-   + Na+

on addition of strong acid HCl

on addition of HCl . H+ ions coming from HCl are react with CH3COO- forms weak acid so there is no change in pH value

CH3COO- + H+ -----------------> CH3COOH

on addition of strong base NaOH

the OH- ions coming from strong base react with weak acid forms acetate and H2O .

CH3COOH + OH- -----------------------> CH3COO- + H2O

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