Chemistry 10 Dr. Scholefield Chapter 13 Worksheet Homework is not collected or graded, but should be worked on seriously every week. Solution Molarity, Dilutions and Stoichiometry 1. 13.9 g of solid KNO3 are dissolved in enough water to make 175 mL of an aqueous potassium nitrate solution. What is the molarity of this solution? 2. How many moles of HCl are dissolved in 25.0 mL of a 4.36 M hydrochloric acid solution? How many grams of HCl are dissolved in this solution? 3. What volume (in mL) of a 0.650 M aqueous glucose solution (C6H12O6) contains 5.48 grams of glucose? 4. A solution is prepared by mixing 36.0 g of CaCl2 with 271 g water. The density of this solution is 1.09 g/mL. a. What is the molarity of this solution? b. Suppose 55.0 mL of water are now added to this solution. What is its new molarity? 5. What volume of 18.0 M H2SO4 (aq) and water would you need to prepare 5.00 L of 2.65 M H2SO4 (aq)? 6. Oxygen gas can be generated by the catalytic decomposition of an aqueous solution of hydrogen peroxide: 2 H2O2 (aq) → 2 H2O (l) + O2 (g) If the complete decomposition of 48.2 mL of H2O2 (aq) yields 2.33 grams of oxygen, what is the molarity of this solution?7. Consider the reaction: 3 CuSO4 (aq) + 2 Na3PO4 (aq) → Cu3(PO4 )2 (s) + 3 Na2SO4 (aq) a. What volume (in milliliters) of a 2.93 M aqueous solution of sodium phosphate will completely react with 41.8 mL of a 1.65 M aqueous solution of copper(II) sulfate? b. What mass of solid copper(II) phosphate precipitate (in grams) will be produced by this reaction? 8. During a certain titration, 32.9 mL of 0.124 M aqueous barium hydroxide was required to completely neutralize 25.0 mL of nitric acid. Determine the molarity of the nitric acid. 9. Consider the reaction: Al2(CO3)3 (s) + 6 HCl (aq) → 3 CO2 (g) + 3 H2O (l) + 2 AlCl3 (aq) What volume (in L) of carbon dioxide gas will be collected at STP if 4.00 grams of aluminum carbonate are mixed with 34.7 mL of 6.00 M hydrochloric acid? 10. Which of the two molecules shown below do you expect to be more soluble in water? Why? HF•••••• OO•••••••• 11. Consider the following scenarios and determine if the substances in question are ionic, polar covalent or nonpolar covalent. Substance A is insoluble in water, but dissolves readily in the solvent CS2. Substance B dissolves readily in water. The resulting solution conducts electricity. Substance C dissolves readily in water. The resulting solution does not conduct electricity. 12. Consider the ionic compound magnesium fluoride MgF2. a. Sketch a diagram showing the interactions between the ions and water when this compound is dissolved. b. Do you expect MgF2 to be more or less soluble than MgCO3 in water? Why? c. Do you expect MgF2 to be more or less soluble than NaF in water?
View Full Document
Unlocking...