Solubility and Common ion effect November 17, 2017 Solubility and Common ion effect Equilibrium Learning Target: I CAN calculate the solubility given Ksp and vice versa, apply common ion effect, and general equilibrium principles to solubility equilibria

November 17, 2017 Do Now (4 min) Learning target: I CAN calculate the solubility given Ksp and vice versa, apply common ion effect, and general equilibrium principles to solubility equilibria Do Now (Answer on your Do Now Sheet): What are the solubility rules? Learning Target: I CAN calculate the solubility given Ksp and vice versa, apply common ion effect, and general equilibrium principles to solubility equilibria

announcements November 17, 2017 Lab 4 – Due Tuesday, November 21 Afterschool tutoring – every Wednesday 3 -4 PM (except thanksgiving week) Marking period final – tuesday 11/28 Learning Target: I CAN calculate the solubility given Ksp and vice versa, apply common ion effect, and general equilibrium principles to solubility equilibria

Solubility packet – page 1 (6 min) November 17, 2017 Solubility packet – page 1 (6 min) Read page 1 silently and independently Annotate: underline, circle, leave yourself notes in the margins Main points: When the reaction is at equilibrium, the solution is saturated. solubility of silver carbonate is actually the equilibrium concentration of the carbonate ion or ½ of the silver ion concentration. Ag2CO3 (s) = 2Ag+(aq) + CO32−(aq) Ksp = [Ag+]2[ CO32−] = 8.1 x 10−12 Learning Target: I CAN calculate the solubility given Ksp and vice versa, apply common ion effect, and general equilibrium principles to solubility equilibria

Pairs: problems 1 and 2 (30 sec) November 17, 2017 Pairs: problems 1 and 2 (30 sec) 1. A. Write the balanced equation for calcium hydroxide dissolving in H2O. Learning Target: I CAN calculate the solubility given Ksp and vice versa, apply common ion effect, and general equilibrium principles to solubility equilibria

Pairs: problems 1 and 2 (2 min) November 17, 2017 Pairs: problems 1 and 2 (2 min) b. The solubility of calcium hydroxide is 0.012 M. What are the concentrations of calcium ion and hydroxide ion in a saturated solution? [Ca2+]eq = [OH-]eq = Learning Target: I CAN calculate the solubility given Ksp and vice versa, apply common ion effect, and general equilibrium principles to solubility equilibria

Pairs: problems 1 and 2 (3 min) November 17, 2017 Pairs: problems 1 and 2 (3 min) 1 c. Write the equilibrium constant expression and calculate Ksp for this reaction. Learning Target: I CAN calculate the solubility given Ksp and vice versa, apply common ion effect, and general equilibrium principles to solubility equilibria

Pairs: problems 1 and 2 (6 min) November 17, 2017 Pairs: problems 1 and 2 (6 min) 2. a. Write the balanced equation for calcium phosphate dissolving in H2O. b. The solubility of calcium phosphate is 2.21 x 10-4 g/L. What are the molar concentrations of calcium ion and phosphate ion in a saturated solution? (molecular wt. of calcium phosphate = 310.18 g/mole) [Ca2+]eq = [PO43-]eq = c. Write the equilibrium constant expression and calculate Ksp for this reaction. Learning Target: I CAN calculate the solubility given Ksp and vice versa, apply common ion effect, and general equilibrium principles to solubility equilibria

Pairs: problem 3 (5 min) November 17, 2017 3. Calculate the molar solubilities of the following: a. CuCO3 (Ksp = 2.5 x 10-10) dissolution reaction: R I C E Solubility = __________ M Learning Target: I CAN calculate the solubility given Ksp and vice versa, apply common ion effect, and general equilibrium principles to solubility equilibria

Pairs: problem 3 (5 min) November 17, 2017 3. Calculate the molar solubilities of the following: b. Ag2SO4 (Ksp = 1.7 x 10-5) dissolution reaction: R I C E Solubility = __________ M Learning Target: I CAN calculate the solubility given Ksp and vice versa, apply common ion effect, and general equilibrium principles to solubility equilibria

Pairs: problem 4 (4 min) November 17, 2017 4. In a saturated solution of magnesium phosphate, [Mg2+] = 2.4 x 10-6 M and [PO43-] = 1.6 x 10-6 M. What is the solubility of magnesium phosphate? Learning Target: I CAN calculate the solubility given Ksp and vice versa, apply common ion effect, and general equilibrium principles to solubility equilibria

Pairs: problem 5 (7 min) November 17, 2017 5. When two soluble salts combine, sometimes a new insoluble salt is formed. AB + CD  CB + AD a. Using your knowledge of solubility rules, predict whether or not a precipitate will form when a solution of lead (II) nitrate is mixed with a solution of sodium chloride. WRITE THE EQUATION. b. Write the molecular, total ionic, and net ionic equations for the reaction. Molecular: Total ionic: Net ionic: Learning Target: I CAN calculate the solubility given Ksp and vice versa, apply common ion effect, and general equilibrium principles to solubility equilibria

K Q vs. Q versus K November 17, 2017 To predict whether or not a precipitate will form, simply compare Q to ksp: Q < ksp, no precipitate will form Q > ksp, a precipitate will form Q = ksp, the solution is aturated (no precipitate) vs. Q Learning Target: I CAN calculate the solubility given Ksp and vice versa, apply common ion effect, and general equilibrium principles to solubility equilibria

Pairs: problems 6 and 7 (12 min) November 17, 2017 Pairs: problems 6 and 7 (12 min) WRITE THE REACTIONS!!!! Learning Target: I CAN calculate the solubility given Ksp and vice versa, apply common ion effect, and general equilibrium principles to solubility equilibria

Pairs: problem 8 (4 min + 10 min) November 17, 2017 Pairs: problem 8 (4 min + 10 min) Solve part a – in groups Solve part b – ALL TOGETHER!!! Learning Target: I CAN calculate the solubility given Ksp and vice versa, apply common ion effect, and general equilibrium principles to solubility equilibria

Pairs: problem 9, 7* - 8* November 17, 2017 Write out your reactions Use your pencil to figure out shifts Use RICE!!! Learning Target: I CAN calculate the solubility given Ksp and vice versa, apply common ion effect, and general equilibrium principles to solubility equilibria

Remainder for homework November 17, 2017 Remainder for homework Complete the remainder of the worksheet for homework – due monday, November 20 Learning Target: I CAN calculate the solubility given Ksp and vice versa, apply common ion effect, and general equilibrium principles to solubility equilibria

November 17, 2017 Exit ticket (3 min) On a separate sheet of paper: What is the solubility for an ionic substance, AB, with a Ksp of 1 x 10-7? Learning Target: I CAN calculate the solubility given Ksp and vice versa, apply common ion effect, and general equilibrium principles to solubility equilibria