`pH` of a solution solution at `25^(@)C` is `2`. If the pH is to be doubled , the hydronium ion concentration of the solution should be

Options

A. doubled
B. halved
C. decreased by 100 times
D. increased by 100 times.

Answer

C

Explanation

`pH=2 :. [H_(3)O^(+)]=10^(-2)`
For `pH =4, [H_(3)O^(+)]=10^(-4)`
This means , `[H^(+)]` conc. Should decrease from `10^(-2)` to `10^(-4)`, i.e., by 100 times.