Question

What is the hydroxide ion concentration of a solution whose pOH is 6.42?

Answer 1

Answer : The hydroxide ion concentration of a solution is, $3.8\times 10^{-7}M$

Explanation :

As we know that:

pH : It is defined as the negative logarithm of hydrogen ion concentration.

Mathematically,

$pH=-\log [H^+]$

Similarly,

pOH : It is defined as the negative logarithm of hydroxide ion concentration.

Mathematically,

$pOH=-\log [OH^-]$

Given:

pOH = 6.42

$6.42=-\log [OH^-]$

$[OH^-]=3.8\times 10^{-7}M$

Therefore, the hydroxide ion concentration of a solution is, $3.8\times 10^{-7}M$