Question

What is the formula for calculating the pH

Answer 1

pH= -log[H3O+]


Hope this will help you.

Answer 2

pH is the negative logarithm of concentration of hydronium ions in aqueous solution.

pH = - log[H₃O⁺]

First we have to know the concentration of H⁺ ions or hydronium ions [H₃O⁺] in the solution, then we can calculate the pH.
To know the pOH we can simply do  14 - pH.

Hope This Helps You!