Question

The concentration of hydrogen ions [H⁺] in a solution is 4.5 × 10⁻² M. What is the pH?

a) 1.35
b) 2.35
c) 4.50
d) 5.35

Answer 1

The pH of a solution with a hydrogen ion concentration of 4.5 × 10⁻² M is calculated using the formula pH = -log[H+], which results in a pH of 1.35.

Step-by-step explanation:

To calculate the pH of a solution with a given hydrogen ion concentration [H+], the formula pH = -log[H+] is used. With a hydrogen ion concentration of 4.5 × 10⁻² M, the calculation is as follows:

pH = -log[4.5 × 10⁻²]

Using a calculator, we find that the pH is:

pH = -(-1.35)

pH = 1.35

Therefore, the correct answer is a) 1.35.