Question

Calculate the pOH of a 7.68x10-7 M HCl solution.


pOH = (round to 3 sig figs)

Answer 1

pOH = 7.89

Step-by-step explanation:

As HCl is a strong acid, [H⁺] is equal to the original acid concentration. In other words:

• [H⁺] = 7.68x10⁻⁷ M

Knowing [H⁺], we calculate the pH of the solution:

• pH = -log[H⁺]

• pH = 6.11

With the pH, we can calculate the pOH of the solution, using the following formula:

• pOH = 14 - pH

• pOH = 7.89