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Question

What volume of water is to be added to 100 cm3 of 0.5 M NaOH solution to make it 0.1 M solution?

A
200 cm3
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B
400 cm3
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C
500 cm3
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D
100 cm3
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Solution

The correct option is B 400 cm3
Initial molarity, M1=0.5 M, initial volume, V1=100cm3
Final molarity, M2=0.1 M, initial volume, V1=Vcm3
using M1V1=M2V2
0.5×100=0.1×V
V=500cm3
Volume of water added =500100=400cm3

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