Unit 3: Solutions
Solutions Practice Problems
Name: ________________________
Date: ________________ Per: ____
Directions: answer each of the following problems. Sig figs, units and neatness count. Circle your answer.
1. What is the molarity of the solution produced when 145g of sodium chloride is dissolved in sufficient water
to prepare 2.75 L of solution?
2. How many grams of potassium chloride are needed to prepare .750 L of a 1.50 M solution of potassium
chloride in water?
3. What is the molarity of the solution produced when 85.6g of hydrochloric acid is dissolved in sufficient
water to prepare .385 L of solution?
4. To prepare 10,500. L of a 2.50 M solution of potassium hydroxide, how many grams of potassium hydroxide
must be used?
5. What is the molarity of solid solder wire if it is made from 68.7g of lead dissolved in 117g of tin? Hint: the
density of tin is 7.3 g/mL
6. In order to prepare a .523 M aqueous solution of potassium iodide, how many grams of potassium iodide
must be added to 2.00 L of water?
7. A gas mixture contains 45.6g of carbon monoxide and 899g of carbon dioxide. What is the molarity of
carbon monoxide if the density of carbon dioxide is 1.98g/L
8. What is the molarity of oxygen in a 185.0 g sample of air that contains 66.8g of oxygen. Air has a density of
1.28 g/L.