100 cc of HCl of pH value 1 is mixed with 100 cc of distilled water. The pH value of the resultant solution is

Options

A. 1.7
B. 1.9
C. 2.5
D. 1.3

Answer

D

Explanation

`pH=1` means `[H^(+)]=10^(-1)M`
On adding equal amount of water, `[H^(+)]=(10^(-1))/(2)`
`pH=-log 5 xx 10^(-2) =2-0.7 =1.3`