There are two sample of HCl having molarity 1 M and 0.25 M. Find volume of these sample taken in order to prepare 0.75 M HCl solution. (Assume no water is used)
A
20 ml, 10 ml
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B
100 ml, 50 ml
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C
40 ml, 20 ml
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D
50 ml, 25 ml
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Solution
The correct options are A 20 ml, 10 ml B 100 ml, 50 ml C 40 ml, 20 ml D 50 ml, 25 ml Final molarity =V1×1+V2×0.25(V1+V2) 0.75(V1+V2)=V1+0.25V2 0.75V1+0.75V2=V1+0.25V2 0.5V2=0.25V1 V1V2=2 So, ratio of V1V2 should be 2