SOLUTION: This is from a worksheet: In a chemistry class, 6 liters of a 4% silver iodide solution must be mixed with a 10% solution to get a 6% solution. How many liters of the 10% solutio

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Question 87963: This is from a worksheet: In a chemistry class, 6 liters of a 4% silver iodide solution must be mixed with a 10% solution to get a 6% solution. How many liters of the 10% solution is needed?
Answer by stanbon(75887) About Me  (Show Source):
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In a chemistry class, 6 liters of a 4% silver iodide solution must be mixed with a 10% solution to get a 6% solution. How many liters of the 10% solution is needed?
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Amt of 4% solution = 6 L ; Amt of active ingredient = 0.04*6 = 0.24 L
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Amt of 10% solution = x L ; Amt of active ingredient = 0.10x L
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Amto of 6% mixture = "6+x" L; Amt of active = 0.06(6+x)=0.36+0.06x L
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EQUATION:
active + active = active
0.24 + 0.10x = 0.36+0.06x
0.04x = 0.12
x = 3 L (Amt of 10% solution that must be added)
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Cheers,
Stan H.