A 1 litre solution of pH=1 is diluted upto 10 times. What volume of a solution with pH=2 needs to be added in diluted solution so that the final pH remains '2'?
A
1 litre
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B
10 litre
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C
100 litre
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D
25 litre
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Solution
The correct options are A 1 litre B 10 litre C 100 litre D 25 litre Before dilution, the pH is 1. This corresponds to 0.1 M hydrogen ion concentration. When the solution is diluted 10 times, its hydrogen ion concentration will be 0.01 M ⇒ pH =2.
To this solution, when a solution with pH = 2 is added, the hydrogen ion concentration and pH of the resulting mixture will remain the same. This is irrespective of the volume of the solution added.