An aqueous 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
Of nitrous acid is 1.36 × 10^-3.

Question

An aqueous 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

Of nitrous acid is 1.36 × 10^-3.

Quizplus · Accepted Answer

A buffer solution contains a weak acid and its corresponding conjugate base or a weak base and its corresponding conjugate acid. Here, nitrous acid and sodium nitrite are present in the solution, which forms a buffer system. When a small amount of HCl is added, it reacts with one of the components of the buffer solution. Among the given options, only nitrite ion is present in the buffer solution, and it can react with HCl to form nitrous acid, which is a weak acid and helps to maintain the pH of the buffer solution. Therefore, the correct choice is C, nitrite ion.

An Aqueous Solution Is Prepared by Dissolving 0