1.

A 1 litre solution of pH=1 diluted upto 10 times.What volume of a solutions with pH =2 is to be added in diluted solution so that final pH remains '2'.

Answer»

1 litre
10 litre
100 litre
25 litre

Solution :After DILUTION `[H^+]=10^(-2) implies pH=2`
Let V litre solution of pH=2 is added in original solution so that pH REMAINS fixed.
`:. [H^+]=(10^(-2)xx10+Vxx10^(-2))/(10+V)=10^(-2)`
This result is INDEPENDENT of volume TAKEN.


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