SOLUTION: a chemist wishes to mix a solution that is 4% acid. She has on hand 8 liters of a 2% acid solution and wishes to add some 8% acid solution to obtain the desired 4% acid solution. H

Algebra ->  Customizable Word Problem Solvers  -> Mixtures -> SOLUTION: a chemist wishes to mix a solution that is 4% acid. She has on hand 8 liters of a 2% acid solution and wishes to add some 8% acid solution to obtain the desired 4% acid solution. H      Log On

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Question 1038405: a chemist wishes to mix a solution that is 4% acid. She has on hand 8 liters of a 2% acid solution and wishes to add some 8% acid solution to obtain the desired 4% acid solution. How much 8% acid solution should she add
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +x+ = liters of 8% acid to be added
+.02%2A8+=+.16+ liters of acid in 2% solution
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+%28+.16+%2B+.08x+%29+%2F+%28+8+%2B+x+%29+=+.04+
+.16+%2B+.08x+=+.04%2A%28+8+%2B+x+%29+
+.16+%2B+.08x+=+.32+%2B+.04x+
+.04x+=+.16+
+x+=+4+
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She should add 4 liters of 8% acid
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check:
+%28+.16+%2B+.08x+%29+%2F+%28+8+%2B+x+%29+=+.04+
+%28+.16+%2B+.08%2A4+%29+%2F+%28+8+%2B+4+%29+=+.04+
+%28+.16+%2B+.32+%29+%2F+12+=+.04+
+.48+=+.04%2A12+
+.48+=+.48+
OK