Question 998261
How many cubic centimeters of pure hydrochloric acid should be added to 20 cubic centimeters of a 30% solution of hydrochloric acid to obtain a 50% solution?
let x=amt of pure hydrochloric acid to add
30%20+x=50%(30+x)
6+x=15+.50x
.50x=9
x=18
How many cubic centimeters of pure hydrochloric acid should be added? 18