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Question

A 50 mL solution of strong acid of pH = 1 is mixed with a 50 mL solution of strong acid of pH = 2. The pH of the mixture will be :
(log105.5=0.74)

A
0.74
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B
1.26
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C
1.76
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D
1.5
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Solution

The correct option is B 1.26
pHacid 1=1 ; M1=[H+]=101pHacid 2=2 ; M2=[H+]=102M3=[H+]mixture V1=50 mL , V2=50 mLV3=V1+V2=100 mLApplying:
M1V1+M2V2=M3V3M3=M1V1+M2V2V3=(101× 50)+(102× 50)100M3=[H+]=5.5×102pH= log10[H+]= log10(5.5×102)pH= (0.742)=1.26 Ans

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