Question

20.0 ml of a 0.0985 M solution of sodium hydroxide is added to 18.0 ml of a 0.103 M solution of hydrochloric acid. What is the pH of the final solution?

a. 1.98
b. 7.00
c. 1.42
d. 14.00

Answer 1

The pH of the final solution is 7.00.

Step-by-step explanation:

To determine the pH of the final solution, we need to consider the neutralization reaction between sodium hydroxide (NaOH) and hydrochloric acid (HCl). The balanced equation for this reaction is:

NaOH + HCl → NaCl + H2O

Since NaOH is a strong base and HCl is a strong acid, they completely dissociate in water. This means that the final solution will contain only the sodium chloride (NaCl) salt and water (H2O).

The pH of a neutral solution is 7.0, so the answer is b. 7.00.