Question

A solution has [H3O+] = 1 x 10-4 M. What is the pOH?

Answer 1

pOH of solution = 10

Further explanation

pH is the degree of acidity of a solution that depends on the concentration of H⁺ ions. The greater the value the more acidic the solution and the smaller the pH.

$\large{\boxed{\bold{pH=-log [H^+]}}}$

pH=-log[H₃O⁺]

$\tt pH=-log[1\times 10^{-4}]\\\\pH=4\\\\pH+pOH=14\\\\pOH=14-4\\\\pOH=10$