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Question 889983: A class of nursing students will perform an experiment wherein they will need a solution of 160 cubic centimetres that is 12% hydrochloric acid. If the laboratory storeroom has only solutions containing 20% and 10% hydrochloric acid, how much of each available solution should be mixed to obtain the desired solution containing 12% hydrochloric acid.
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! A class of nursing students will perform an experiment wherein they will need a solution of 160 cubic centimetres that is 12% hydrochloric acid. If the laboratory storeroom has only solutions containing 20% and 10% hydrochloric acid, how much of each available solution should be mixed to obtain the desired solution containing 12% hydrochloric acid.
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Equation:
acid + acid = acid
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0.20x + 0.10(160-x) = 0.12*160
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20x + 10*160 - 10x = 12*160
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10x = 2*160
x = 32 cc (amt. of 20% solution needed)
160-x = 128 cc (amt. of 10% solution needed
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Cheers,
Stan H.
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