Calculate the pH of a `10^(-5)M HCl` solution if 1mL of it is diluted to 1000mL. `K_(w)=1 xx 10^(-14)`.

Options

A. `5`
B. `8`
C. `7.02`
D. `6.98`

Answer

D

Explanation

`M_(1)V_(1) = M_(2)V_(2)`
`10^(-5) xx1 = M_(2) xx 1000`
`M_(2) = 10^(-8)`
`[H_(3)O^(o+)] = 10^(-8)M`
Since the `[H_(3)O^(o+)] lt 10^(-6)`
so `pH ~~ 6.98`