Question 154631: How much pure acid should be mixed with 2 gallons of a 40% acid solution in order to get a 70% acid solution? Answer by nerdybill(7384) (Show Source):
You can put this solution on YOUR website! How much pure acid should be mixed with 2 gallons of a 40% acid solution in order to get a 70% acid solution?
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Let x = gallons of pure acid to be added
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The equation is derived from:
"acid added from pure acid solution" + "acid from 40% solution" =
"70% of total solution"
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x + .40(2) = .70(2+x)
x + .80 = 1.40 + .70x
.30x = .60
x = 2 gallons
