SOLUTION: a chemist wants to obtain 80 liters of a solution that is 12% hydrochloric acid. how many liters of 10% and 20% hydrochloric acid solutions should he mix to do so?

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Question 742036: a chemist wants to obtain 80 liters of a solution that is 12% hydrochloric acid. how many liters of 10% and 20% hydrochloric acid solutions should he mix to do so?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
a chemist wants to obtain 80 liters of a solution that is 12% hydrochloric acid. how many liters of 10% and 20% hydrochloric acid solutions should he mix to do so?
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Equation:
acid + acid = acid
0.10x + 0.20(80-x) = 0.12*80
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10x + 20*80 - 20x = 12*80
-10x = -8*80
x = 64 liters (amt. of 10% solution needed)
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80-64 = 16 liters (amt. of 20% solution needed)
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Cheers,
Stan H.