Definitions:
Solution- a substance dissolved in liquid
Concentration -percentage of the substance in the solution.
Mixture - two substances combined.
Example:
A chemist has one solution that is 30% pure salt and another solution that is 60% pure salt. How many ounces of each must he use to produce 60 ounces of a solution that is 50% salt?
(A) 10
(B) 15
(C) 20
(D) 25
(E) 30
Solution:
The easiest way to solve this problem is with a table.
We let x = the total amount of ounces in solution I.
We add the values of the last column and set them to equal 30, the amount of salt in the mixed solution.
0.3x + 36 - 0.6x = 30
6 = 0.3x
x = 20
(46)
(28)
(2)