SOLUTION: How many liters of a 5% solution of hydrochloric acid must be mixed with 12 liters of a 1% solution to obtain a 4% solution?

Question 414996: How many liters of a 5% solution of hydrochloric acid must be mixed with 12 liters of a 1% solution to obtain a 4% solution?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
How many liters of a 5% solution of hydrochloric acid must be mixed with 12 liters of a 1% solution to obtain a 4% solution?
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Equation:
acid + acid = acid
0.05x + 0.01*12 = 0.04(x+12)
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Multiply thru by 100 to get:
5x + 12 = 4x + 4*12
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x = 3*12
x = 36 liters (amt. of 5% solution needed)
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Cheers,
Stan H.
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