SOLUTION: How much 12% acid must be added to 2 gallons of pure water to get a mixture that is 7%.

Question 1017200: How much 12% acid must be added to 2 gallons of pure water to get a mixture that is 7%.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
How much 12% acid must be added to 2 gallons
of pure water to get a mixture that is 7%.
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Equation::
acid + acid = acid
0*2 + 0.12x = 0.07(2+x)
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0.12x = 0.14 + 0.07x
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0.05x = 0.14
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x = 14/5
x = 2.8 gallons (amt. of 12% solution to add)
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Cheers,
Stan H.
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