Question

What is the acid concentration of a sample of acid rain with a pH of 4.20?

Answer 1

`6.3times10^-5`mol/L

Explanation:

`pH=-log_10[H^+]`

Given that `pH` is 4.2

`:. 4.2=-log_10[H+]`

`10^(-4.2)=[H^+]`

Taking antilog we get

`[H^+]=6.3times10^(-5)` mol/L