Question

From the value of ionic product of water is 25⁰c,find out the concentration of hydroxyl ion (at25⁰c concentration of hydrogen ions in water is 10-⁷ mol/dm³

Answer 1

The concentration of hydroxyl ions in water is $10^{-7}M$

Explanation:

The chemical equation for the ionization of water follows:

$H_2O\rightleftharpoons H^++OH^-$

The expression of $K_w$ for above equation, we get:

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

We are given:

$K_w=10^{-14}$   (At 25°C)

$[H^+]=10^{-7}mol/dm^3=10^{-7}M$

Putting values in above equation, we get:

$10^{-14}=10^{-7}\times [OH^-]$

$[OH^-]=10^{-7}M$

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