During an experiment Daksh and Laksh were asked to prepare a 12%(w/w) solution of sodium chloride in water. Daksh dissolved 120 g salt in 500 g of water and made the final volume 900 g by adding more water to it. Laksh prepared 600 g of 10%(w/w) aqueous solution of salt and evaporated 100 g of water from it. Now choose the correct option.
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Laksh made the required amount of solution in the experiment.
Given:
The solution of Daksh contains:
mass of salt = 120 g,
volume of water = 500 g
final volume = 900 g.
Therefore,
percentage of m/m = 120 x 100 / 900
The percentage = 13.33 % (w/w)
Laksh's solution contains:
10% (w/w) = mass of salt x 100 / 600 = 60 g
When a 100 g of water is evaporated, mass of the remaining salt= 500 g
Therefore,
percentage of m/m = 60 x 100 / 500
The percentage = 12% (w/w)
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