Solutions Worksheet #2 - Georgetown High School



Solutions Worksheet #2

(Molarity, Dilutions, Percent Solutions, Molality Problems)

Molarity

1. Tell how you would prepare a 500. mL of 0.50 M ammonium carbonate solution. Include all necessary equipment and amount of chemical (in grams).

2. What is the molarity of each of the following solutions?

a. 40.0 grams of sodium hydroxide in 1.50 L of solution

b. 4.10 grams of magnesium chloride in 300. mL of solution

3. If 0.885 moles of copper (II) sulfate are dissolved in enough water to make 70.0 mL of solution, what is the molarity of the solution?

4. What is the molarity of a 400. mL solution in which 3.70 moles of sodium acetate are dissolved?

5. How many grams of calcium nitrate are needed to make 3.30 L of a 0.10 M solution?

Molarity of Ions in Solution

6. Calculate the molarity of the ions in the following solutions:

a. 0.917M aluminum sulfate

b. 1.25M aluminum chloride

Dilutions

7. If 30.0 mL of 12.0 M HCl stock solution are diluted to a volume of 500. mL, what is the molarity of the dilute solution?

8. If 27.5 mL of 16.0 M nitric acid stock solution is added to 300. mL of water, what is the molarity of the diluted solution? (V1 will be 27.5 mL. But for V2 don’t forget to add the volume of the water and the nitric acid to get the total V2 volume.)

9. If 50.0 mL of a stock sulfuric acid solution whose molarity is 15.0 M is diluted until the molarity of the new solution is 2.50 M, what is the volume of the new solution?

Molality

10. How many grams of water must be added to 455 grams of potassium sulfate in order to make a 1.50 m solution?

11. If 300. grams of magnesium acetate are added to 5000. grams of water, what is the molality of the solution?

12. How many grams of lithium nitrate are required to add to 800. grams of water in order to prepare a 2.00 m solution?

Percent Solutions

13. If 40.0 grams of ammonium hydroxide are added to 200. mL of water, what is the percent by mass of this solution?

14. An alcohol-water solution is by volume 40.0% isopropyl alcohol. There are 500. mL of the solution. How many mL of alcohol were added to water when preparing the solution?

15. If 35.0 mL of ethanol, C2H5OH, were added to 65.0 mL of water, what is the percent by volume of the solution?

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