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

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Question 29277: A chemist has 40 mL of a solution that is 50% acid. How much water should he add to make a solution that is 10% acid?
Answer by Paul(988) About Me  (Show Source):
You can put this solution on YOUR website!
40(50)=10(x+40)
2000=10x+400
10x=1600
x=160

Hence, about 160mL of water is needed.
Paul.