Question

Find the ph of a 0.3molar solution of h202 dissolved in 500ml of water

Answer 1

Solution.

Hydrogen peroxide is a very weak acid, so we need the following formula to calculate pH.

$$pH = \frac{pKa}{2} - \frac{lg(C)}{2}$$

$$C = \frac{n}{V}$$

C = 0.6 M

$$pH = \frac{11.58}{2} - \frac{lg(0.6)}{2}$$

pH = 5.90

Answer:

pH = 5.90