Question

carrie is conducting an experiment on a solution. the solutions 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)

Explanation:

• A strong acid (like HCl) would lower the pH of the solution. So option A is incorrect.
• A salt (like NaCl) usually has a neutral effect on the pH of a solution (assuming no hydrolysis - relevant factors). So option C is incorrect.
• A strong base (like NaOH) can react with the acidic components in the solution (if it was initially acidic, pH = 3.2) and increase the pH. As more base is added, the pH can rise to an alkaline range (pH = 9.8).

Answer:

B. a strong base, such as sodium hydroxide (NaOH)