SOLUTION: how much pure acid should be mix with 2 gallonsof 40% acid solution in order to get a 70%acid solution. can you please show me how to do it my self, thanks

Question 188875: how much pure acid should be mix with 2 gallonsof 40% acid solution in order to get a 70%acid solution. can you please show me how to do it my self, thanks
Found 2 solutions by Alan3354, nerdybill:
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
how much pure acid should be mix with 2 gallonsof 40% acid solution in order to get a 70%acid solution.
-------------------
2 gals of 40% has 0.8 gals of acid and 1.2 gals of water.
If acid is added to be 70%, then the 1.2 gals of water will be 30% of the solution.
If 1.2 gals is 0.3 of the solution, then the total is 4 gallons. Add 2 gallons to make it 70%.

Answer by nerdybill(7384) (Show Source): You can put this solution on YOUR website!
how much pure acid should be mix with 2 gallonsof 40% acid solution in order to get a 70%acid solution. can you please show me how to do it my self, thanks
.
Let x = amount of pure (100%) acid added
then
"amt of acid added" + "amt of acid of original mix" = "70% of total mixture"
x + .40(2) = .70(x+2)
x + .80 = .70x + 1.40
.30x + .80 = 1.40
.30x = .60
x = .60/.30
x = 2 gallons

RELATED QUESTIONS
how much pure acid should be mixed with 2 gallons of a 40% acid solution in order to get... (answered by stanbon)
How much pure acid should be mixed with 2 gallons of a 40% acid solution in order to get... (answered by Paul)
How much pure acid should be mixed with 2 gallons of a 40% acid solution in order to get... (answered by nerdybill)
how much pure acid should be mixed with 2 gallons of a 40% acid solution in order to get... (answered by Earlsdon)
how much pure acid should be mixed with 2 gallons of a 40% acid solution in order to get... (answered by swincher4391)
how much pure acid should be mixed with 2 gallons of a 40% acid solution in order to get... (answered by josgarithmetic,richwmiller)
How much pure acid should be mixed with 2 liters of a 40% acid solution in order to get... (answered by Alan3354)
how much pure acid should be mixed with 7 gallons of a 40% acid solution in order to get... (answered by stanbon,ptaylor)
How much pure acid should be mixed with 7 gallons of a 40% acid solution in order to get... (answered by josgarithmetic)