Question

What is the concentration of hydroxide ions in a potato water solution if [H₃O⁺] = 1.5×10⁻⁶ M?

Answer 1

The ionic product of water is defined as:

$K_w = [H_3O^+][OH^-] = 10^{-14}$ .

Therefore, the concentration of hydroxide ions is:

$[OH^-] =\frac{K_w}{[H_3O^+]} =\frac{10^{-14}}{1.5\cdot10^{-6}}=6.7\cdot10^{-9}$ M.