SOLUTION: For an experiment, a chemist needs 12 liters of a solution that is 30% hydrochloric acid. However, she only has two solutions that are 25% hydrochloric acid and 40% hydrochloric ac
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Question 1025799: For an experiment, a chemist needs 12 liters of a solution that is 30% hydrochloric acid. However, she only has two solutions that are 25% hydrochloric acid and 40% hydrochloric acid. How many liters of each should she mix in order to obtain the needed solution?
I didn't understand it. Please help! Thanks! Answer by mananth(16946) (Show Source):
You can put this solution on YOUR website! Acid %
percent ---------------- quantity
Solution I 25.00% ---------------- x liters
Solution II 40.00% ------ 12 - x liters
Mixture 30.00% ---------------- 12
12
25.00% x + 40.00% ( 12 - x ) = 30.00% * 12
25 x + 40 ( 12 - x ) = 360
25 x + 480 - 40 x = 360
25 x - 40 x = 360 - -480
-15 x = -120
/ -15
x = 8 liters 25.00% Solution I
4 liters 40.00% Solution II
