EVAPORATION
Level
pending
A 100 kg.salt solution 3% by weight sodium chloride in water is evaporated until concentration is 4% by weight sodium chloride. What is the weight of the water (in kg) in the original solution evaporated?
The answer is 25.
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1 solution
(.03)(100)- 0(x)=(.04)(100-x)
x= 25 kgs.