1.

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 ?

Answer»

0.1 L
0.9 L
2.0 L
9.0 L

SOLUTION :`pH=1 therefore [H^(+)]_(1)=10^(-1)M`
`pH=2 therefore [H^(+)]_(2)=10^(-2)M`
According to DILUTION law,
`M_(1)V_(1)=M_(2)V_(2)`
`10^(-1)XX1=10^(-2)xx V_(2)`
`V_(2)=(10^(-1)xx1)/(10^(-2))=10L`
`therefore` WATER to be added `=10-1=9L`.


Discussion

No Comment Found

Related InterviewSolutions