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SCH4U Unit #2: EQUILIBRIUM

SCH4U Unit #2: EQUILIBRIUM . Ms. Cornacchione Wed Mar 19 th 2014. AGENDA. Test 3 – Equilibrium Part 1 Continue with Acid-Base Equilibrium Notes and Examples. Unit #2: Acid/Base Equilibrium TOPICS. Bronsted Lowry Acids & Bases (8.1) Strong and Weak Acids & Bases (8.2)

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SCH4U Unit #2: EQUILIBRIUM

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  1. SCH4UUnit #2: EQUILIBRIUM Ms. Cornacchione Wed Mar 19th 2014

  2. AGENDA • Test 3 – Equilibrium Part 1 • Continue with Acid-Base Equilibrium Notes and Examples

  3. Unit #2: Acid/Base EquilibriumTOPICS • Bronsted Lowry Acids & Bases (8.1) • Strong and Weak Acids & Bases (8.2) • Acid Calculations (8.4) • Base Calculations • Acid-Base Properties of Salts • Acid-Base Titration • Buffer Systems

  4. Acid Calculations • Strong acids (ionize completely) • Can assume [H+] = [HA(aq)] to calculate pH • Weak acids (ionize partially) • Must consider EQM (Initial, Change, and EQM Concs) and Ka, to calculate pH • Percent Ionization – percentage of solute that ionizes when it dissolves in a solvent

  5. EXAMPLES – Strong Acid

  6. EXAMPLES – % Ionization from pH

  7. EXAMPLES – CalcKa from % Ionization (TIP: Use an ICE Table)

  8. EXAMPLES – Calc pH from Ka (TIP: Use an ICE Table)

  9. EXAMPLES – CalcKafrom pH

  10. Polyprotic Acids Monoprotic acids – possesses only one ionizable (acidic) hydrogen atom (eg. HCl(aq)) Polyprotic acids – possesses more than one ionizable (acidic) hydrogen atom (eg. H2SO4(aq)) H2A ⇌ H+ + HA- Ka1= [H+][HA-] [H2A] HA-⇌ H+ + A- Ka2 = [H+ ][A-] [HA- ]

  11. EXAMPLES – pH for a Polyprotic Acid

  12. Practice Makes Perfect!! • Page 525 Q#1-9 • Complete the “Acid-Base EQM” Worksheet

  13. Unit #2: Acid/Base EquilibriumTOPICS • Bronsted Lowry Acids & Bases (8.1) • Strong and Weak Acids & Bases (8.2) • Acid Calculations (8.4) • Base Calculations (8.5) • Acid-Base Properties of Salts • Acid-Base Titration • Buffer Systems

  14. Base Calculations • Strong bases (ionize completely) pH + pOH = 14 • Weak bases (ionize partially) • Must consider EQM and Kb, to calculate pOH

  15. EXAMPLES – Calc [H+], [OH-] for Strong Base

  16. EXAMPLES – pH for a Strong Base

  17. EXAMPLES– pH for Weak Base

  18. Unit #2: Acid/Base EquilibriumTOPICS • Bronsted Lowry Acids & Bases • Strong and Weak Acids & Bases • Acid Calculations • Base Calculations • Acid-Base Properties of Salts • Acid-Base Titration • Buffer Systems

  19. Acid-Base Properties of Salt Solutions • Many salts are highly soluble in water and easily dissociate into ions that may or may not change the pH of the solution (acidic, basic, or neutral) • We must consider how well each ion acts as an acid or a base (the stronger one wins!)

  20. Acid-Base Properties of Salts

  21. Salts That Produce Neutral Solutions

  22. Salts That Produce Basic Solutions

  23. Salts That ProduceAcidicSolutions

  24. Acid-Base Properties of Salts

  25. Hydrolysis of Amphiprotic Ions

  26. Hydrolysis of Metallic and Non-metallic Oxides • Metallic • Non-metallic

  27. EXAMPLE

  28. EXAMPLE

  29. EXAMPLE – Acidity of a Metallic Oxide Solution

  30. Practice Makes Perfect • Complete all Section 8.6 Practice Problems • Do Page 539 Q#2-5

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