A solution is prepared by dissolving 0.23 mol of hydrazoic acid and 0.27 mol of

Question

A solution is prepared by dissolving 0.23 mol of hydrazoic acid and 0.27 mol of sodium azide in water sufficient to yield 1.00 L of solution. The addition of 0.05 mol of HCl to this buffer solution causes the pH to drop slightly. The pH does not decrease drastically because the HCl reacts with the ________ present in the buffer solution. The Ka of hydrazoic acid is 1.9 10-5.

A. H3O+ B. hydrazoic acid C. H2O D. azide ion E. This is a buffer solution: the pH does not change upon addition of acid or base.

Explanation / Answer

Answer:-

D. azide ion.

on addition of HCl the pH does not decrease drastically because H+ reaction with azide ion result in the formation hydrazoic acid which is a weak acid.

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