SOLUTION: chemist mixes an 8% hydrochloric acid solution with a 5% hydrochloric acid solution. How many milliliters of the 5% solution should the chemist use to make a 750-milliliter solutio

Question 118111: chemist mixes an 8% hydrochloric acid solution with a 5% hydrochloric acid solution. How many milliliters of the 5% solution should the chemist use to make a 750-milliliter solution that is 7% hydrochloric acid?
Answer by Earlsdon(6294) (Show Source): You can put this solution on YOUR website!
Let x = the number of milliliters of the 5% hydrochloric acid solution.
Then,(750-x) = the number of milliliters of the 8% hydrochloric acid solution.
The sum of these two amounts is to equal 750 milliliters of 7% hydrochloric acid solution.
The amount of hydrochloric acid in each of these amounts of solution can be written:
Simplify and solve for x.
Combine like-terms.
Subtract 60 from both sides.
Divide both sides by -0.03

The chemist will require 250 ml of the 5% hydrochloric acid solution.
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