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Write the equation for the dissociation of a generic monoprotic acid: HA + H₂O ⇌ H₃O⁺ + A⁻
Write the dissociation constant expression. Ka=[H₃O⁺][A⁻][HA]
Determine the equilibrium concentrations. pH = -log[H₃O⁺] = 4.69. ...
Substitute these values in the expression and that is it!
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