If the concentration of OH–ions in the reaction Fe(OH)₃(s) ⇌ Fe³⁺(aq) + 3OH^–(aq) is decreased by 14 times, then equilibrium concentration of Fe³⁺ will increase by :

Calculate the pOH of a solution at 25°C that contains 1× 10^–10 M of hydronium ions, i.e. H₃O⁺.