Question 269449: how many liters of water must be added to 20L of a 75% acid solution to produce a solution that is 15% acid?
Answer by drk(1908)   (Show Source):
You can put this solution on YOUR website! This is a mixture problem. Here is a table based on the given information
liquid . . . . . . . . .% . . . . . . . . . . liters . . . . . . . . .%liters
acid . . . . . . . . . 75. . . . . . . . . . .20 . . . . . . . . . . 1500
water . . . . . . . . 0 . . . . . . . . . . . x . . . . . . . . . . . 0
mixture . . . . . . 15. . . . . . . . . . .20+x. . . . . . . . . 300 + 15x
looking at column 3, we get
1500 + 0 = 300 + 15x
subtracting 300, we get
1200 = 15x
divide by 15 to get
x = 80
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you must add 80 liters of water
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