# Hydroxide Ion Concentration Calculations Tutorial

## Key Concepts

- The hydroxide ion concentration in an aqueous solution, [OH
^{-}], in mol L^{-1}, can be calculated if the pOH of the solution is known. - pOH is defined as the negative logarithm (to base 10) of the hydroxide ion concentration in mol L
^{-1}pOH = -log

_{10}[OH^{-}]

[OH^{-}] is the concentration of hydroxide ions in mol L^{-1}(mol/L or M) - [OH
^{-}] in mol L^{-1}can be calculated using the equation (formula):[OH

^{-}] = 10^{-pOH} - As the pOH increases, the concentration of hydroxide ions in the solution decreases.
As the pOH decreases, the concentration of hydroxide ions in the solution increases.