SOLUTION: A chemist has 100 liters of 20% sodium chloride solution. She intends to drain a certain number of liters and replace with a more concentrated solution. a) How much of this solu

Question 819041: A chemist has 100 liters of 20% sodium chloride solution. She intends to drain a certain number of liters and replace with a more concentrated solution.
a) How much of this solution should she drain and replace with 70% sodium chloride if she wants a 35% sodium chloride solution?
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
20(100 - v) + 70v = 35(100)
2000 - 20v + 70v = 3500
50v = 1500
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v = 30
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answer:
drain 30 liters, and replace with 30 liters of 70% sodium chloride solution
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