Question

The $pH$ of an acid buffer can be raised by 2 units by

• A. Increaseing the concentration of both weak acid and salt by two moles
• B. Increasing the concentration of both the acid and salt by 10 times
• C. Diluting the solution by $10$ times
• D. Increasing the concentration of the salt by 10times and decreasing concentration of the acid by $10$ times

Answer 1

The correct option is D Increasing the concentration of the salt by 10times and decreasing concentration of the acid by $10$ times

For an acidic buffer, $pH=p{K}_a+log\frac{\left[salt\right]}{\left[acid\right]}$

So pH can be increased by 2 unit by increasing the concentration of the salt by 10 fold and decreasing concentration of the acid by 10 fold.