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

Question

A solution is prepared by dissolving 0.23 mol of nitrous acid and 0.27 mol of sodium nitrite 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 nitrous acid is 1.36 × 10-3.

A) H2O

B) H3O+

C) nitrite ion

D) nitrous acid

E) This is a buffer solution: the pH does not change upon addition of acid or base.

Explanation / Answer

Answer:- C

The given system represent acidic buffer as it contains a weak acid and it's salt with strong base. The pH of buffer solution don't change upon addition of small amount of acid or alkali as they are consumed by component of buffer.

In given case HCl added would react with Nitrite ion as it is the basic component of buffer.

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