Question

Carrie is conducting an experiment on a solution. The solution's initial pH is 3.2. Then, as Carrie gradually adds Compound X into the solution, the pH increases to 9.8. Which is the most likely identity of Compound X? A. a strong acid, such as hydrochloric acid (HCl) B. a strong base, such as sodium hydroxide (NaOH) C. a salt, such as sodium chloride (NaCl) D. a solvent, such as water (H2O)

Answer 1

Answer:

B

Explanation:

The correct answer would be a strong base, such as sodium hydroxide (NaOH).

The pH of a substance represents the degree of acidity or basicity of the compound. The pH scale ranges from 0 to 14 with 0 being the most acidic, 14 being the most basic, and 7 being a neutral pH. a pH below 7 is acidic and above 7 is basic.

A solution with an initial pH of 3.2 is acidic and in order to raise the pH to 9.8, it will require a strong base. Hence, compound X must be a strong base such as sodium hydroxide.

Correct option: B