The dissociation constant of water is represented by K= [H_3O^+][… - Vidyadip

MCQ

The dissociation constant of water is represented by $\text{K}=\frac{[\text{H}_3\text{O}^+][\text{OH}^-]}{[\text{H}_2\text{O}]}$$\text{or }=[\text{H}^+][\text{OH}^-]\text{K}_{\text{w}}$ is called:

A
Ionic product of salts.
✓
Ionic product of water.
C
Ionisation constant of water.
D
Ionisation constant of acid and base.

✓

Answer

Correct option: B.

Ionic product of water.

The dissociation constant is represented by,
$\text{K}=\frac{[\text{H}_3\text{O}^+][\text{OH}^-]}{[\text{H}_2\text{O}]}$
The concentration of water is omitted from the denominator as water is a pure liquid and its concentration remains constant. $\ce{[H_2O)}$ is incorporated within the equilibrium constant to give a new constant, $K_w$, which is called the ionic product of water,
$\text{K}_{\text{w}}=[\text{H}^+][\text{OH}^-]$

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