Question

When $1.0$ ml of dil. $HCl$ acid is added to $100$ ml of a buffer solution of pH $4.0$ the $pH$ of the solution:

• A. becomes $7$
• B. does not change
• C. small change
• D. becomes $10$

Answer 1

Answer: (B)

does not change

The $pH$ of the buffer solution does not change because $1.0ml$ of dilute $HCl$ is added.

By adding a small amount of dilute acid it does not change the $pH$ of the buffer solution.