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How many litres of water must be added to 1 litre 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 [H^(+)] = 10^(-1) = 0.1 M`
`pH = 2 [H^(+)] = 10^(-2) = 0.01`
for dilution of HCl `M_(1)V_(1) = M_(2)V_(2)`
`0.1 XX 1 = 0.01 xx V_(2)`
`V_(2) = 10 l t`
Volume of water added = 10 - 1 = 1litre.


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