Assertion: When a strong acid is added to a buffer system consisting of a weak acid (HA) and its conjugate base (A-), the concentration of the conjugate base increases. Reason: A stoichiometric amount of the weak acid is converted to its conjugate base. Group of answer choices

Both the assertion and reason are false

Explanation:

A buffer is a solution that resists changes in acidity and alkalinity. When a solution is buffered, it pH can only vary within a small range. A buffer is made up of a weak acid/base and its salt.

When a strong acid is added to a buffer solution, the conjugate base will react with the H+ from the strong acid to form the undissociated weak acid HA as follows; H+(aq) + A- (aq)→ HA(aq). Hence, H+ concentration decreases owing to its reaction with the A- thus the pH changes only slightly.

a is the correct answer