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The pH of solution on mixing equal volum...

The pH of solution on mixing equal volume of solution having pH =3 and pH =4. [log 5.5 =0.7404)

A

3.38

B

3.5

C

3.26

D

4

Text Solution

Verified by Experts

The correct Answer is:
C
When equal volume of solution are mixed, the concentration of solution becomes half.
Before mixing, pH =3 `(pH =-log [H_(3)O^+])`
pH=4
`[H_(3)O^+]=10^(-4)" mol L"^(-1)`
On mixing `[H^+]=1/2 [10^(-3) +10^(-4)]`
`=1/2 xx 10^(-3) [1+0.1]=(1.1)/2 xx 10^(-3) =5.5 xx 10^(-4)`
`pH =-log [H_(3)O^+]=-log (5.5 xx 10^(-4))- 0.704+4.00 =3.26`
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