SOLUTION: in atank are 50 litres water and 20 litres acid .how many litres of water must be evaporated to make the solution 40 % acid ?

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Question 944223: in atank are 50 litres water and 20 litres acid .how many litres of water must be evaporated to make the solution 40 % acid ?
Answer by macston(5194) About Me  (Show Source):
You can put this solution on YOUR website!
20 L is 40% of (20 L)/0.40= 50 Liters, so total volume of a 40 % solution with 20 L of acid would be 50 L. Presently we have 20 L acid + 50 L water= 70 L of solution, we need to evaporate 20 L to reach 50 L and 40% concentration.