Solve the problem.
-How much pure acid should be mixed with 5 gallons of a 50% acid solution in order to get an 80% acidsolution?
A)7.5 gal
B)2.5 gal
C)20 gal
D)12.5 gal

Question

Quizplus · Accepted Answer

Let x be the amount of pure acid to be added. Then, the total amount of acid in the new solution will be 0.5 * 5 + x = 2.5 + x. The total amount of solution will be 5 + x. So, the concentration of the new solution will be (2.5 + x) / (5 + x) = 0.8. Solving for x, we get x = 7.5.

Solve the Problem. -How Much Pure Acid Should Be Mixed with 5 Gallons