SOLUTION: If you wish to increase the percent of acid in 50 mL of a 15% acid solution in water to a 25% acid, how much pure acid must you add? Thank you.

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Question 994765: If you wish to increase the percent of acid in 50 mL of a 15% acid solution in water to a 25% acid, how much pure acid must you add?
Thank you.
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
If you wish to increase the percent of acid in 50 mL of a 15% acid solution in water to a 25% acid, how much pure acid must you add?
:
let x = amt of pure acid required
:
A typical mixture equation based on the amt of acid in the water
.15(50) + x = .25(x+50)
7.5 + x = .25x + 12.5
x - .25x = 12.5 - 7.5
.75x = 5
x = 5/.75
x = 62%2F3 mL of pure acid required