SOLUTION: A chemist wants to make 700mL of a 6% acid solution by using 5% and 12% acid solutions. How much of each should she use?

Question 697168: A chemist wants to make 700mL of a 6% acid solution by using 5% and 12% acid solutions. How much of each should she use?

Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = ml of 5% solution needed
Let = ml of 12% solution needed
given:
(1)
(2)
------------------------------
(2)
(2)
(2)
Multiply both sides of (1) by
and subtract (1) from (2)
(2)
(1)

and, since
(1)
(1)
(1)
600 ml of 5% solution is needed
100 ml of 12% solution is needed
-----------------------------
check answer:
(2)
(2)
(2)
(2)
OK

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