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August 21, 2014

August 21, 2014

Posted by **amy** on Thursday, March 29, 2012 at 10:05am.

i dont even know what equation to use or anything, please help me, thank you.

- math help -
**Steve**, Thursday, March 29, 2012 at 12:02pmthe amount of acid in a solution is the % times the volume.

For example 5L of 50% solution has 2.5L of acid.

So, if you add up all the acid in the parts of your solution, they must add up to the total acid at the end.

If x is the amount of 18% solution, then there must be 5-x liters of 40% solution, since the total volume is 5 liters.

Now, adding up the amount of acid, we need

.18x + .40(5-x) = .312(5)

.18x + 2 - .4x = 1.56

.22x = .44

x = 2

so, 2L of 18% and 3L of 40% will produce 5L of 31.2%

.18*2 + .40*3 = .36+1.2 = 1.56 = .312*5

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