SOLUTION: Jamal needs to create a nitric acid solution which is less than 15% nitric acid. He begins with 12 fluid ounces of a 20% nitric acid solution in water and he adds 8 fluid ounces of

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Question 1124917: Jamal needs to create a nitric acid solution which is less than 15% nitric acid. He begins with 12 fluid ounces of a 20% nitric acid solution in water and he adds 8 fluid ounces of water. Does he need to add more water?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
The addition must be to add acid TO water; not the other way around. SAFETY!

This is only approximate. Density information may be necessary depending on how the concentration information is intended:

12%2A0.20%2F%28x%2B12%29=0.15
-
0.2%2A12=0.15x%2B0.15%2A12
0.2%2A12-0.15%2A12=0.15x
0.05%2A12=0.15x
x=4
Just a guess, about 4 fluid ounces of water would be necessary; probably not need
8 fluid ounces.