SOLUTION: how many liters of water must be added to 8 liters of 40% acid solution to obtain a 10% acid solution?

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Question 406396: how many liters of water must be added to 8 liters of 40% acid solution to obtain a 10% acid solution?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
how many liters of water must be added to 8 liters of 40% acid solution to obtain a 10% acid solution?
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Equation:
water + water = water
0.60*8 + 1x = 0.90(8+x)
Multiply thru by 100 to get:
60*8 + 100x = 90*8 + 90x
10x = 30*8
x = (1/3)(8)L
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x = 2 2/3 liters (amt. of water needed)
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Cheers,
Stan H.
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