SOLUTION: I have a gallon of 32% HCL and wish to dilute to 15% HCL. How do I figure the ratio of HCL to water

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Question 494254: I have a gallon of 32% HCL and wish to dilute to 15% HCL. How do I figure the ratio of HCL to water
Answer by chessace(471) About Me  (Show Source):
You can put this solution on YOUR website!
If % is by weight, you will have to know the weight ratio.
So let's assume it's % by volume.
You have a gallon of stuff, 32% is HCL, so 68% is H20.
You are going to add x gallons H2O so that the result is 15% HCL.
HCL / Total.stuff = 15%
(.32 gal)/(1+x gal) = 0.15
32 = 15 + 15x
x = 17/15 = 1 2/15 gal