Which acid dissociation constant (ka indicates the weakest acid? 8.5 * 10-3m 1.5 * 10-10m 3.5 * 10-7m 5.1 * 10-5m?

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Chemistry

12 June, 17:38

Which acid dissociation constant (ka indicates the weakest acid? 8.5 * 10-3m 1.5 * 10-10m 3.5 * 10-7m 5.1 * 10-5m?

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Gia Black · Answer 1

Answer is: the weakest acid is with Ka = 1.5 * 10⁻¹⁰ M.

Ka is the acid dissociation constant, which quantifies the extent of acid dissociation in water.

The lower is the acid dissociation constant, the weaker is the acid, because concentration of hydrogen ions (H⁺) or hydronium ions (H₃O⁺) is very low.

For some acid, chemical reaction in water: HA (aq) ⇄ A⁻ (aq) + H⁺ (aq), acid dissociation constant is: Ka = [A⁻]·[H⁺] / [HA ].