Question 966256
how much pure acid do you have to add to 250 mL of an 8% acid solution to get a 20% acid solution.
let x=amt of pure acid to add
8%(250)+100%x=20%(250+x)
20+x=50+.2x
0.8x=30
x=37.5
how much pure acid do you have to add? 37.5 mL