how much water should be added to 500ml of a 5mM solution to get 2M
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How much water should be added to 500ml of a 5 M solution to get a 2 M solution?
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Since on dilution the number of moles (of solute) remain the same, thus we can write
M1V1=M2V2
Where M1 is initial molarity
V1 is initial volume
M2 is final molarity
V2 is final volume
Thus 500*5=2*V2
Which gives V2=1250 ml
Now since this is final volume thus water “added” = 1250–500 = 750 ml
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