Grade 12 Mixture Problems Worksheet
A comprehensive worksheet for Grade 12 students to practice solving mixture problems involving percentages, concentrations, and quantities.
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Grade 12 Mixture Problems
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Read each problem carefully and solve for the unknown quantities. Show all your work. Use diagrams or tables to organize your information where helpful.
1. A chemist has two solutions of hydrochloric acid. One solution is 30% acid and the other is 70% acid. How much of each solution should be mixed to obtain 100 mL of a 50% acid solution?
2. An alloy containing 20% copper is mixed with an alloy containing 50% copper to form 150 kg of an alloy containing 30% copper. The amount of 20% copper alloy used is kg, and the amount of 50% copper alloy used is kg.
3. When mixing two solutions of different concentrations, the resulting concentration will always be between the two initial concentrations.
True
False
4. A candy store wants to mix two types of candy. One type sells for $5 per pound and the other sells for $8 per pound. How many pounds of the $5 candy should be mixed with 20 pounds of the $8 candy to get a mixture that sells for $6 per pound?
10 pounds
20 pounds
30 pounds
40 pounds
5. An investor has $20,000 to invest in two different funds. Fund A pays 4% interest annually, and Fund B pays 6% interest annually. If the investor wants to earn $1,000 in annual interest, how much should be invested in each fund?
6. Imagine you have a beaker of a 20% salt solution. If you add pure water to it, what happens to the concentration of salt? Draw a simple diagram to illustrate this process.
