CHM 40 Thursday 2/11/10 HW chapter 15 Name 1. Calculate the molarity of each of the following solutions a. 22.6 g LiCl in a 2.8 L solution b. 4.3 moles of NaBr in a 154.4 mL solution 2. A laboratory procedure calls for making 400.0 mL of a 1.1 M NaNO3 solution. What mass of NaNO3 (in g ) is needed? 3. a. If 123 mL of a 1.1M glucose solution is diluted to 500.0 mL, what is the molarity of the diluted solution? b. To what volume should you dilute 25.0 mL of a 10.0 M H2SO4 solution to obtain a 0.150 M H2SO4 4. Calculate the mass in grams of solute present in each of the following a. 225 g of 2.91% ammonium nitrate solution b. 1.00 kg of 4.95% potassium bromide solution 5. Many metal ions are precipitated from solution by the sufide ion. As an example, consider treating a solution of copper (II) sulfate with sodium sulfide solution CuSO4(aq) + Na2S(aq) CuS(s) + Na2SO4(aq) What volume of 0.105 M Na2S solution would be required to precipitate all of the copper (II) ion from 27.5 mL of 0.121 M CuSO4 solution? 6. Consider the following reaction: 2Na3PO4(aq) + 3 CuCl2(aq) Cu3(PO4)2(s) + 6 NaCl(aq) How much Cu3(PO4)2 (in grams) will be produced when 80.0 mL of 0.175 M Na3PO4 reacted with 95.4 mL of 0.102 M CuCl2? 7. What volume of 0.101 M HCl is required to neutralize 12.7 mL of 0.501 M Ca(OH)2? *hint: write a balanced chemical equation 8. A solution of the sparingly soluble base Ca(OH)2 is prepared in a volumetric flask by dissolving 5.21 mg of Ca(OH)2 to a total volume of 1000.0 mL. Calculate the molarity and normality of the solution