Question

1. a substance which helps maintain a constant ph in a solution is a(n)

a. salt.
b. acid.
c. base.
d. buffer.

Explanation:

A buffer is a solution that resists changes in pH when small amounts of an acid or a base are added. It consists of a weak acid and its conjugate base or a weak base and its conjugate acid. Salts are ionic compounds formed from the reaction of an acid and a base. Acids donate protons (\(H^{+}\)) in solution. Bases accept protons (\(H^{+}\)) in solution. Since the question is about a substance that helps maintain a constant pH, the concept of a buffer is relevant here.

Answer:

D. buffer.