SOLUTION: A chemist has 40mL of solution that is 50% acid. How much water should be added to make a solution that is 10% acid?

Question 29301: A chemist has 40mL of solution that is 50% acid. How much water should be added to make a solution that is 10% acid?
Answer by bmauger(101) (Show Source): You can put this solution on YOUR website!
If 40mL of the solution is 50% acid, that means that the solution is made of 20mL pure acid. 10% of what number is 20? Write 0.1x=20 Divide both sides by 0.1 to get x=200 So you need a total of 200mL of liquid, since you've already got 40mL, 200-40=160 mL of water you still need.
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