Question

If the pH is 10, what is the concentration of hydroxide ion?

A. 10-10
B. 10-24
C. 10-4
D. 10-14

Answer 1

Answer : The correct option is,
`10^(-4)M`

Explanation : Given,

pH = 10

First we have to calculate the pOH.

`pH+pOH=14\\\\pOH=14-pH\\\\pOH=14-10=4`

Now we have to calculate the
`OH^-` concentration.

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

`4=-\log [OH^-]`

`[OH^-]=1.0* 10^(-4)M`

Therefore, the
`OH^-` concentration is,
`1.0* 10^(-4)M`