How many litres of water must be added to `1 L` of an aqueous solution of `HCl` with a `pH` of `1` to create an aqueous solution with `pH` of `2`?

Options

A. `0.1L`
B. `0.9L`
C. `2.0L`
D. `9.0L`

Explanation

`pH=1rArr [H^(+)]=10^(-1)=0.1M`
`pH=2rArr [H^(+)]=10^(-2)=0.01M`
for dilution of `HCl M_(1)V_(1)=M_(2)V_(2)`
`0.1xx1=0.01xxV_(2)`
`V_(2)=10L`
Volume of water added `=10-1=9 litres`.