2-9 Weighted Averages-Percent Mixture Problems
Name: _________________________________________
Pd________
1) How many grams of water must be added to 8 grams of 25% sugar solution to produce a 10%
sugar solution?
Let g = grams of water
+
=
Equation:
2) How many pounds of water must be evaporated from 70 pounds of an 8% starch solution to
produce a 20% solution?
–
=
Equation:
3) How many ounces of 75% antiseptic solution must be added to 60 ounces of a 15% solution
to produce a 50% solution?
+
Equation:
=
Percent Mixture Practice
Solve the following. Think about what is being added or evaporated.
1) How many milliliters of water must be added to 16 mL of a 25% salt solution to obtain a
10% solution?
2) How much water must be evaporated from 150 L of a 4% salt solution to leave a solution
that is 6% salt?
3) How many liters of pure acid (100% acid) must be added to 20 L of a 20% acid solution
to make a 50% solution?
4) A 40L solution of salt water contains 15% salt. What is the least amount of water that
can be added to form a solution that is no more than 5% salt?