Question

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

Your answer:
3.8 x 10-7M
2.6 x 10-7M
2.6 x 10-8 M
3.8 x 10-8 M

Answer 1

Answer : The hydroxide ion concentration of a solution is,
`3.8* 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* 10^(-7)M`

Therefore, the hydroxide ion concentration of a solution is,
`3.8* 10^(-7)M`