JEE Advanced2009ChemistryIonic EquilibriumActual

The dissociation constant of a substituted benzoic acid at 25^ C is 1.0 10⁻⁴ . The pH of 0.01 M solution of its sodium salt is

Correct answer

Step-by-step solution

The hydrolysis reaction of conjugate base of acid is gathered A⁻(a q)+ H ₂ O HO ⁻+ HA K_h= K_w K_a = 10⁻¹⁴ 10⁻⁴ =10⁻¹⁰ gathered Since, degree of hydrolysis is negligible; [ OH ⁻ ]= K_h C =10⁻⁶ p[ OH ]=6 and pH =14-6=8

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