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Question

10 mL of M100H2SO4 solution is mixed with 20 mL of M10 H2SO4 solution. Find the pH of resulting solution.

A
0.85
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B
0.69
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C
0.314
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D
1.2
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Solution

The correct option is A 0.85
The final concentration (Cf) is given as:
C1V1+C2V2=CfVf(1100×101000)+(110×201000)=Cf×301000Cf=0.07 MNow since, H2SO42H++SO242H+ ions are there.So concentration=2×Cf=2×0.07=0.14pH=log10(0.14)pH=0.85

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