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

Options

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

Answer

D

Explanation

`because pH=1, H^(1)=10^(-1)=0.1M`
`pH=2, H^(+)=10^(-2)=0.01M`
`therefore M_(1)=0.1 V=1`
`M_(2)=0.01 V_(2)=?`
From
`M_(1)V_(1)=M_(2)V_(2)`
`0.1xx1=0.01xxV_(2)`
`V_(2)=10` litres ltbr. `therefore` Volume of water added =10-1=9 litres