SOLUTION: A Chemist needs 500 milliliters of a solution that is 40% sulfuric acid, but all the she can find in the lab are solutions that are 25% sulfuric acid. How much of each should she m

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Question 716996: A Chemist needs 500 milliliters of a solution that is 40% sulfuric acid, but all the she can find in the lab are solutions that are 25% sulfuric acid. How much of each should she mix?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
This chemist wants a more concentrated solution of sulfuric acid than the 25% concentration reported available in the description. This chemist should have 96% or 98% sulfuric acid present, otherwise cannot make the 40% concentration which is wanted.

Does this person have maybe 50% sulfuric acid present?
x for how much 25%, y for how much 50%.
Still, there would be too much difference in densities. Volume units used for measurement? Assuming the concentrations are by volume, %w/v,
%2825x%2B50y%29%2F500=40 and x%2By=500.
Solve for x and y.