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A solution of HCl contains 0.1920 g of a...

A solution of `HCl` contains `0.1920 g` of an acid in `0.5 litre` of a solution. The degree of dissociation is `95%`. The `pH` of the solution is

A

`4.0`

B

`2.0`

C

`2.192`

D

`1.92`

Text Solution

Verified by Experts

The correct Answer is:
B
Concentration `C` of `HCl` solution
`=(0.1920)/(36.5xx0.5)=0.010 M`
The degree of dissociation is `95%`, i.e., `= 0.95`
Therefore, `[H^(+)]=0.010xx0.95=0.0095`
`pH =-log[H^(+)]= -log(0.0095)`
`= -[bar3.(9777)]=-(-2.02)=2.0`
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