1. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Dissociation Dissociation is separation of ions that occurs when an ionic compound dissolves. Chapter 13 Section 1 Compounds in Aqueous Solution 1 mol 1 mol 1 mol 1 mol 1 mol 2 mol

2. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Dissociation of NaCl Chapter 13 Section 1 Compounds in Aqueous Solution

3. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Dissociation, continued Sample Problem A Write the equation for the dissolution of aluminum sulfate, Al 2 (SO 4 ) 3, in water. How many moles of aluminum ions and sulfate ions are produced by dissolving 1 mol of aluminum sulfate? What is the total number of moles of ions produced by dissolving 1 mol of aluminum sulfate? Chapter 13 Section 1 Compounds in Aqueous Solution

4. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Dissociation, continued Sample Problem A Solution Given: amount of solute = 1 mol Al 2 (SO 4 ) 3 solvent identity = water Unknown: a. moles of aluminum ions and sulfate ions b. total number of moles of solute ions produced Solution: Chapter 13 Section 1 Compounds in Aqueous Solution

5. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Dissociation, continued Precipitation Reactions Although no ionic compound is completely insoluble, compounds of very low solubility can be considered insoluble for most practical purposes. Chapter 13 Section 1 Compounds in Aqueous Solution

6. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu General Solubility Guidelines Chapter 13 Section 1 Compounds in Aqueous Solution

7. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Soluble and Insoluble Ionic Compounds Chapter 13 Section 1 Compounds in Aqueous Solution

8. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Particle Model for the Formation of a Precipitate Chapter 13 Section 1 Compounds in Aqueous Solution

9. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Visual Concepts Click below to watch the Visual Concept. View: 75268.swf Precipitation Reactions Chapter 13

10. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Dissociation, continued Net Ionic Equations A net ionic equation includes only those compounds and ions that undergo a chemical change in a reaction in an aqueous solution. Ions that do not take part in a chemical reaction and are found in solution both before and after the reaction are spectator ions. Chapter 13 Section 1 Compounds in Aqueous Solution

11. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Dissociation, continued Net Ionic Equations, continued Overall ionic equation Chapter 13 Section 1 Compounds in Aqueous Solution net ionic equation

12. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Writing a Net Ionic Equation Chapter 13 Section 1 Compounds in Aqueous Solution

13. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Visual Concepts Net Ionic Equation Chapter 13 View 75269.avi OR.mov

14. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Dissociation, continued Net Ionic Equations, continued Sample Problem B Identify the precipitate that forms when aqueous solutions of zinc nitrate and ammonium sulfide are combined. Write the equation for the possible double- displacement reaction. Then write the formula equation, overall ionic equation, and net ionic equation for the reaction. Chapter 13 Section 1 Compounds in Aqueous Solution

15. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Sample Problem B Solution Given: identity of reactants: zinc nitrate and ammonium sulfide reaction medium: aqueous solution Unknown: a. equation for the possible double-displacement reaction b. identity of the precipitate c. formula equation d. overall ionic equation e. net ionic equation Chapter 13 Section 1 Compounds in Aqueous Solution Dissociation, continued Net Ionic Equations, continued

16. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Sample Problem B Solution, continued Solution: a.equation for the possible double-displacement reaction Chapter 13 Section 1 Compounds in Aqueous Solution b.Table 1 reveals that zinc sulfide is not a soluble sulfide and is therefore a precipitate. Ammonium nitrate is soluble according to the table. c.The formula equation Dissociation, continued Net Ionic Equations, continued

17. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Sample Problem B Solution, continued d.The overall ionic equation Chapter 13 Section 1 Compounds in Aqueous Solution e.The ammonium and nitrate ions appear on both sides of the equation as spectator ions. The net ionic equation Dissociation, continued Net Ionic Equations, continued

18. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu 10. Write the formula equation, the overall ionic equation, and the net ionic equation for the precipitation reaction that occurs when solutions of zinc chloride, ZnCl 2, and sodium sulfide, Na 2 S, are mixed. Chapter 13 Standardized Test Preparation Short Answer

19. Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu 10. Write the formula equation, the overall ionic equation, and the net ionic equation for the precipitation reaction that occurs when solutions of zinc chloride, ZnCl 2, and sodium sulfide, Na 2 S, are mixed. Answer: formula: ZnCl 2 (aq) + Na 2 S(aq) ZnS(s) + 2NaCl(aq) overall ionic: Zn 2+ (aq) + 2Cl − (aq) + 2Na + (aq) + S 2− (aq) ZnS(s) + 2Na + (aq) + 2Cl − (aq) Net ionic: Zn 2+ (aq) + S 2− (aq) ZnS(s) Chapter 13 Standardized Test Preparation Short Answer