Question

Ionic product of water is

Answer 1

Ionic product:

• The sum of ion concentrations increased to the power given by their stoichiometric coefficients in a salt solution.
• The equilibrium constant for the reaction in which water conducts an acid-base reaction with itself is called the ionic product of water, ${\mathrm{K}}_{\mathrm{w}}$.
• That is, water acts as both an acid and a base at the same time.
• The reaction proceeds as follows:

$\underset{\mathrm{Water}}{{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}\rightleftharpoons \underset{\mathrm{Hydrogen}\mathrm{ion}}{{\mathrm{H}}^{+}\left(\mathrm{l}\right)}+\underset{\mathrm{Hydroxide}\mathrm{ion}}{{\mathrm{OH}}^{-}\left(\mathrm{l}\right)}$

• The formula for the ionic product of water is :

${\mathrm{K}}_{\mathrm{w}}=\left[{\mathrm{H}}^{+}\right]\left[{\mathrm{OH}}^{-}\right]$

• At ${25}^{\circ }\mathrm{C}$ the ${\mathrm{K}}_{\mathrm{w}}$ of pure water $=1\times {10}^{-14}{\mathrm{mol}}^2{\mathrm{L}}^{-2}$