Self-Ionisation of Water (Leaving Cert Chemistry): Quizzes

Water molecules react to form ions

$H_3O^+$ and $OH^-$

Dynamic equilibrium

Equilibrium constant for self-ionisation

$K_w = [H^+][OH^-]$

$1.0 \times 10^{-14}$ mol$^2$ dm$^{-6}$

They are equal

$1.0 \times 10^{-7}$ mol dm$^{-3}$

7

$K_w$ increases

Self-ionisation is endothermic

$[H^+]$ and $[OH^-]$ stay equal