SOLUTION: Charles is doing an experiment that calls for a 40% solution of copper sulfate. He has 60 mL of a 25% solution. How many milliliters of a 70% solution should Charles add to obtain

Question 536485: Charles is doing an experiment that calls for a 40% solution of copper sulfate. He has 60 mL of a 25% solution. How many milliliters of a 70% solution should Charles add to obtain the required 40% solution?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = ml of 70% solution needed
given:
= ml of copper sulfate in 70% solution
ml of copper sulfate in 25% solution
----------------
In words:
( final ml of copper sulfate ) / ( final ml of solution ) = 40%

30 ml of 70% solution are needed
check:

OK
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