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How many times a 0.1 M strong monobasic ...

How many times a 0.1 M strong monobasic acid solution should be diluted so that pH of the resulting solution is tripled ?

A

50

B

10

C

25

D

100

Text Solution

Verified by Experts

The correct Answer is:
D
`because pH` = - log [concentration]
Therefore, for change in one unit of pH, concentration must be changed to 10 times.
pH `= log (10^(-1))`
pH = log 10 = 1
If pH = 3, then
`3 - log 10^(-x)`
`3 = x log 10 rArr x = 3`
Thus, for change in concentration (i.e. dilution) to get 3 times of pH, the solution must be diluted to 100 times, i.e.
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