SOLUTION: A chemist has 100 milliliters of a solution that contains a 20% concentration of acid. How many milliliters of pure acid must be added in order to increase the concentration of th

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Question 425549: A chemist has 100 milliliters of a solution that contains a 20% concentration of acid. How many milliliters of pure acid must be added in order to increase the concentration of the solution to 50%?
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
------------- percent ----------------quantity
acid solution 20 ----------------100
pure acid 100 ----------------x
Total 50 ---------------- 100+x
............
20*100+100*x=50(100+x)

2000+100x=5000+50x
100x-50x=5000-2000
50x=3000
/50
x= 60 ml 100%acid solution