Question: What is the result of mixing equal volumes of 0.5 M HCl and 0.5 M NaOH?

Options:

1. pH < 7
2. pH = 7
3. pH > 7
4. No reaction

Correct Answer: pH = 7

Solution:

The equal volumes of HCl and NaOH will neutralize each other, resulting in a pH of 7.