<PRE><B>Question 480287</B>
How many liters of water should be added to 20L of a 30% acid solution to make a solution that is 10% acid?
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Equation:
acid + acid = acid
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0.30*20 + 0*x = 0.10(20+x)
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Multiply thru by 100 to get:
30*20 + 0 = 10*20 + 10x
10x = 20*20
x = 40L (amt. of water that must be added)
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Cheers,
Stan H.</PRE>