A certain weak acid has a dissociation constant 1.0 × 1 0 - 4 . The equilibrium constant for its reaction with a strong base is

Question

A certain weak acid has a dissociation constant 1.0 × 1 0 - 4 . The equilibrium constant for its reaction with a strong base is, 1.0 × 1 0 - 4, 1.0 × 1 0 - 10, 1 × 1 0 10, 1.0 × 1 0 - 14

MARKS App · Accepted Answer

H A ⇌ H + + A - K a = [ H + ] [ A - ] [ H A ] …(i) Also, H A + B + + O H - → B + + A - + H 2 O K e q = [ H 2 O ] [ A - ] [ H A ] [ O H - ] …(ii) By Eqs. (i) and (ii), K e q K a = 1 [ H + ] [ O H - ] = 1 K w So K e q = K a K w = 1 0 - 4 1 0 - 14 = 1 0 10 .

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