SOLUTION: How to prepare 500ml of 50percent of ethanol from a bag of 90 percent of ethanol and water.

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Question 921435: How to prepare 500ml of 50percent of ethanol from a bag of 90 percent of ethanol and water.
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
How to prepare 500ml of 50percent of ethanol from a bag of 90 percent of ethanol and water.
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Equation:
water + water = water
0.10x + 1*(500-x) = 0.50*500
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Multiply thru by 100 to get:
10x + 100*500 - 100x = 50*500
-90x = -50*500
x = (5/9)500
x = 277.78 ml
500-x = 222.22 ml (amt of pure water to add)
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Cheers,
Stan H.
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