Which of the following is not a strong base?

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Multiple Choice

Which of the following is not a strong base?

Explanation:
The concept is that base strength in water is about how completely a substance produces hydroxide ions. Strong bases dissociate completely in aqueous solution, giving a high [OH–]. The hydroxides of sodium, potassium, and barium are classic examples; they dissolve and release OH– ions fully (barium hydroxide provides two OH– per formula unit). Ammonia is different: it is a weak base that accepts a proton from water to form ammonium and OH–, but only to a limited extent at equilibrium. Its base dissociation constant is relatively small, so the amount of OH– produced is much less than with a strong base. Therefore ammonia is not a strong base.

The concept is that base strength in water is about how completely a substance produces hydroxide ions. Strong bases dissociate completely in aqueous solution, giving a high [OH–]. The hydroxides of sodium, potassium, and barium are classic examples; they dissolve and release OH– ions fully (barium hydroxide provides two OH– per formula unit). Ammonia is different: it is a weak base that accepts a proton from water to form ammonium and OH–, but only to a limited extent at equilibrium. Its base dissociation constant is relatively small, so the amount of OH– produced is much less than with a strong base. Therefore ammonia is not a strong base.

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