SOLUTION: In your chemistry class, you are given a bottle of 5% acid solution and a bottle of 2% acid solution. You need 60 mL of a 3% solution for an experiment. How much of each solution

Question 1097016: In your chemistry class, you are given a bottle of 5% acid solution and a bottle of 2% acid solution. You need 60 mL of a 3% solution for an experiment. How much of each solution do you need to mix together to get the desired concentration?
Found 2 solutions by jorel1380, josmiceli:
Answer by jorel1380(3719) (Show Source): You can put this solution on YOUR website!
Let n and 60-n be the amounts of 5% solution and 2% solution needed, respectively. Then:
.05n+.02(60-n)=.03(60)
Solve for n
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Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = mL of 5% solution needed
Let = mL of 2% solution needed
---------------------------------------
(1) mL
(2)
------------------------------------
(2)
(2)
(2)
--------------------------------
Multiply both sides of (1) by
and subtract (1) from (2)
(2)
(1)
--------------------------

and
(1)
(1)
---------------------
20 mL of 5% solution are needed
40 mL of 2% solution are needed
---------------------
check:
(2)
(2)
(2)
(2)
(2)
OK
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