SOLUTION: How much 9% HC1 must be mixed with 4% HC1 to produce 50mL of 6% HC1?

Question 958179: How much 9% HC1 must be mixed with 4% HC1 to produce 50mL of 6% HC1?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = ml of 9% HCL needed
Let = ml of 4% HCL needed
--------------------
(1) ml
(2)
------------------------------
(2)
(2)
(2)
---------------------
Multiply both sides of (1) by
and subtract (1) from (2)
(2)
(1)
-------------------------

and
(1)
(2)
20 ml of 9% HCL are needed
30 ml of 4% HCL are needed
---------------
check:
(2)
(2)
(2)
(2)
OK

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