Molarity and Colligative Properties Worksheet

MOLARITY AND COLLIGATIVE PROPERTIES WORKSHEET 1. How many grams of NaI are required to make 250 ml of a 0.5 M solution? 0.5 M = mol/0.25 L mol = 0.125 mol 0.125 mol x 150 g/mol = 18.75 g 2. How many grams of solute are contained in 5 ml of a solution having a concentration of 0.5 grams per ml? 0.5 g/ml x 5 ml = 2.5 g 3. Two liters of NaOH is labelled 2 molar. How many grams of solute are present in this solution? M = mol/L 2 mol/L x 2 L = 4 mol 4 mol x 40 g/mol = 160 g 4. If 500 ml of 1 M HCl is diluted with water to a new volume of 1000 ml, the molarity of the new solution will be 1.0 M 2.0 M 0.25 M 0.50 M 5. How many moles of Ca(NO₃)₂ are needed to prepare 2 liters of a 0.3 M solution? 0.6 mol 6. A 500 ml solution containing 36 grams of KOH is diluted to 1000 ml. What is the new molarity? 0.1 M 7. Which solution contains exactly 0.50 moles of H₂SO₄? 2.0 L of a 0.50 M solution 1.0 L of a 0.50 M solution 2.0 L of a 1.0 M solution 1.0 L of a 1.0 M solution 8. What is the molarity of a solution that contains 4 grams of NaOH in 1000 ml? 0.1 M 0.2 M 2.0 M 0.5 M 9. What is the molarity of a solution that contains 7.30 grams of HCl in 1 liter? 0.1 M 0.2 M 0.8 M 0.4 M 10. A 1.0 M solution contains 20 grams of a compound in 500 ml of solution. What is the molecular mass of this compound? 20 g/mol 40 g/mol 60 g/mol 80 g/mol 11. How many moles of AgNO₃ are in 2000 ml of a 5 M solution? 2.5 5.0 10 170 12. If 0.50 liters of a 12 Molar solution is diluted to 1.0 liters, the molarity of the new solution is * 1. 2.4 * 2. 6.0 * 3. 12 * 4. 24 13. What is the molarity of a solution that contains 112 grams of KOH in 2.0 liters of solution? * 1. 1.0 M * 2. 2.0 M * 3. 3.0 M * 4. 4.0 M 14. What is the number of grams of KCl in 1.00 liters of a 0.200 molar solution? * 1. 7.46 * 2. 14.9 * 3. 22.4 * 4. 29.8 15. What is the molarity of a solution that contains 20 grams of CaBr₂ in 0.50 liter of solution?   * 1. 0.50 * 2. 0.20 * 3. 5.0 * 4. 10 16. What is the molarity of a solution that contains 28 grams of KOH in 2.0 liters of solution?   * 1. 1.0 M * 2. 2.0 M * 3. 0.25 M * 4. 0.50 M 17. If 500 ml of a 4 M HCl solution is diluted with water to a new volume of 1000 ml, the molarity of the new solution will be * 1. 1.0 M * 2. 2.0 M * 3. 0.25 M * 4. 0.50 M 18. How many moles of Ca(NO₃)₂ are needed to prepare 2.0 liters of a 3.0 M solution? * 1. 0.6 * 2. 1.5 * 3. 6.0 * 4. 15 19. How many moles of KNO₃ are required to make 0.50 liters of a 2.0 M solution of KNO₃? * 1. 0 * 2. 2.0 * 3. 0.50 * 4. 4.0 20. Which water solution will have the lowest freezing point? * 1. 1 molal CaCl₂ * 2. 1 molal NaCl * 3. 1 molal C₁₂H₂₂O₁₁ * 4. 2 molal C₆H₁₂O₆ 21. NaOH is added to one beaker of distilled water, and C₂H₅OH is added to another beaker of distilled water. Both of the solutions that are formed will * 1. have a lower boiling point than pure water * 2. be strong electrolytes * 3. have a lower freezing point than pure water * 4. turn litmus paper blue 22. At standard pressure, a molal solution of sugar has a boiling point * 1. greater than 100°C and a freezing point greater than 0°C. * 2. greater than 100°C and a freezing point lower than 0°C. * 3. less than 100°C and a freezing point greater than 0°C * 4. less than 100°C and a freezing point lower than 0°C. 23. A 1 kilogram sample of water will have the highest freezing point when it contains * 1. 1 x 10¹⁷ dissolved particles * 2. 1 x 10¹⁹ dissolved particles * 3. 1 x 10²¹ dissolved particles * 4. 1 x 10²³ dissolved particles