SOLUTION: a laboratory needs to make 135 litter batch of a 20% acid solution. How can the laboratory combine a batch of acid solution the is pure acid with another that is 10%to get the des

Question 713127: a laboratory needs to make 135 litter batch of a 20% acid solution. How can the laboratory combine a batch of acid solution the is pure acid with another that is 10%to get the desired concentration
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = liters of pure acid needed
Let = liters of 10% solution needed
= liters of pure acid in 10% solution
-------------
(1)
(2)
-------------------------
(2)
(2)
(2)
Subtract (1) from (2)
(2)
(1)

and, since
(1)
(1)
(1)
(1)
15 liters of pure acid are needed
120 liters of 10% solution are needed
check:
(2)
(2)
(2)
(2)
(2)
OK
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