Solubility Product Constant Factors Affecting Solubility Selective Precipitation
![Solubility Product Constant Factors Affecting Solubility Selective Precipitation Solubility Product Constant Factors Affecting Solubility Selective Precipitation](https://slidetodoc.com/presentation_image_h2/4f61c64831adf425b9e1084640bd60a0/image-1.jpg)
Solubility Product Constant Factors Affecting Solubility Selective Precipitation
![• Objectives ▫ Today I will be able to: Calculate the solubility product • Objectives ▫ Today I will be able to: Calculate the solubility product](http://slidetodoc.com/presentation_image_h2/4f61c64831adf425b9e1084640bd60a0/image-2.jpg)
• Objectives ▫ Today I will be able to: Calculate the solubility product constant for a compound Explain the factors that affect solubility Determine the compounds that selectively precipitate from a solution when placed under stresses • Informal assessment – monitoring student interactions and questions as they complete the practice problems • Formal assessment – analyzing student responses to the practice problems
![Lesson Sequence • • Evaluate: Warm Up Explain: Notes Elaborate: Practice Problems Evaluate: Exit Lesson Sequence • • Evaluate: Warm Up Explain: Notes Elaborate: Practice Problems Evaluate: Exit](http://slidetodoc.com/presentation_image_h2/4f61c64831adf425b9e1084640bd60a0/image-3.jpg)
Lesson Sequence • • Evaluate: Warm Up Explain: Notes Elaborate: Practice Problems Evaluate: Exit Ticket
![Warm Up Warm Up](http://slidetodoc.com/presentation_image_h2/4f61c64831adf425b9e1084640bd60a0/image-4.jpg)
Warm Up
![Objectives • Today I will be able to: ▫ Calculate the solubility product constant Objectives • Today I will be able to: ▫ Calculate the solubility product constant](http://slidetodoc.com/presentation_image_h2/4f61c64831adf425b9e1084640bd60a0/image-5.jpg)
Objectives • Today I will be able to: ▫ Calculate the solubility product constant for a compound ▫ Explain the factors that affect solubility ▫ Determine the compounds that selectively precipitate from a solution when placed under stresses
![Homework • • Continue working practice problems Ch. 17 49, 51, 53, 55, 57, Homework • • Continue working practice problems Ch. 17 49, 51, 53, 55, 57,](http://slidetodoc.com/presentation_image_h2/4f61c64831adf425b9e1084640bd60a0/image-6.jpg)
Homework • • Continue working practice problems Ch. 17 49, 51, 53, 55, 57, 59 69, 70, 75, 76
![Agenda • • Warm Up Notes Practice Problems Exit Ticket Agenda • • Warm Up Notes Practice Problems Exit Ticket](http://slidetodoc.com/presentation_image_h2/4f61c64831adf425b9e1084640bd60a0/image-7.jpg)
Agenda • • Warm Up Notes Practice Problems Exit Ticket
![Solubility Product Constant Factors Affecting Solubility Selective Precipitation Notes Solubility Product Constant Factors Affecting Solubility Selective Precipitation Notes](http://slidetodoc.com/presentation_image_h2/4f61c64831adf425b9e1084640bd60a0/image-8.jpg)
Solubility Product Constant Factors Affecting Solubility Selective Precipitation Notes
![Solubility Equilibria Solubility Equilibria](http://slidetodoc.com/presentation_image_h2/4f61c64831adf425b9e1084640bd60a0/image-9.jpg)
Solubility Equilibria
![Solubility Product Constant • Consider the equilibrium that exists in a saturated solution of Solubility Product Constant • Consider the equilibrium that exists in a saturated solution of](http://slidetodoc.com/presentation_image_h2/4f61c64831adf425b9e1084640bd60a0/image-10.jpg)
Solubility Product Constant • Consider the equilibrium that exists in a saturated solution of Ba. SO 4 in water: Ba. SO 4(s) Ba 2+(aq) + SO 42−(aq)
![Solubility Product Constant Expression The equilibrium constant expression for this equilibrium is Ksp = Solubility Product Constant Expression The equilibrium constant expression for this equilibrium is Ksp =](http://slidetodoc.com/presentation_image_h2/4f61c64831adf425b9e1084640bd60a0/image-11.jpg)
Solubility Product Constant Expression The equilibrium constant expression for this equilibrium is Ksp = [Ba 2+] [SO 42−] where the equilibrium constant, Ksp, is called the solubility product.
![Ksp is not the same as solubility Ksp is not the same as solubility](http://slidetodoc.com/presentation_image_h2/4f61c64831adf425b9e1084640bd60a0/image-12.jpg)
Ksp is not the same as solubility
![What is solubility? What is Ksp? • Solubility is generally expressed as the mass What is solubility? What is Ksp? • Solubility is generally expressed as the mass](http://slidetodoc.com/presentation_image_h2/4f61c64831adf425b9e1084640bd60a0/image-13.jpg)
What is solubility? What is Ksp? • Solubility is generally expressed as the mass of solute dissolved in 1 L (g/L) or 100 m. L (g/m. L) of solution, or in mol/L (M). • Equilibrium constant for equilibrium between an ionic sold and its saturated solution • Unitless • Larger magnitude means more dissolving occurred • Only one value per temperature • Does not change with p. H or other ions present in solution like solubility
![Calculation • Solid silver chromate is added to pure water at 25 o. C Calculation • Solid silver chromate is added to pure water at 25 o. C](http://slidetodoc.com/presentation_image_h2/4f61c64831adf425b9e1084640bd60a0/image-14.jpg)
Calculation • Solid silver chromate is added to pure water at 25 o. C and some solid remains undissolved. The mixture is stirred for several days to ensure that equilibrium is achieved between the undissolved Ag 2 Cr. O 4 and the solution. Analysis of the equilibrated solution shows that its silver ion concentration is 1. 3 x 10 -4 M. Assuming that the Ag 2 Cr. O 4 solution is saturated , calculate Ksp for the compound.
![Calculation • The Ksp of Ca. F 2 is 3. 9 x 1 o-11 Calculation • The Ksp of Ca. F 2 is 3. 9 x 1 o-11](http://slidetodoc.com/presentation_image_h2/4f61c64831adf425b9e1084640bd60a0/image-15.jpg)
Calculation • The Ksp of Ca. F 2 is 3. 9 x 1 o-11 at 25 o. C. Assuming equilibrium is established between solid and dissolved Ca. F 2, calculate the solubility of Ca. F 2 in grams/liter
![Factors impacting solubility Factors impacting solubility](http://slidetodoc.com/presentation_image_h2/4f61c64831adf425b9e1084640bd60a0/image-16.jpg)
Factors impacting solubility
![1. Common Ion Effect • If one of the ions in a solution equilibrium 1. Common Ion Effect • If one of the ions in a solution equilibrium](http://slidetodoc.com/presentation_image_h2/4f61c64831adf425b9e1084640bd60a0/image-17.jpg)
1. Common Ion Effect • If one of the ions in a solution equilibrium is already dissolved in the solution, the equilibrium will shift to the left and the solubility of the salt will decrease Ba. SO 4(s) Ba 2+(aq) + SO 42−(aq)
![2. p. H ▫ If a substance has a basic anion, it will be 2. p. H ▫ If a substance has a basic anion, it will be](http://slidetodoc.com/presentation_image_h2/4f61c64831adf425b9e1084640bd60a0/image-18.jpg)
2. p. H ▫ If a substance has a basic anion, it will be more soluble in an acidic solution. ▫ Substances with acidic cations are more soluble in basic solutions.
![3. Complex Ions • Complex Ions ▫ Metal ions can act as Lewis acids 3. Complex Ions • Complex Ions ▫ Metal ions can act as Lewis acids](http://slidetodoc.com/presentation_image_h2/4f61c64831adf425b9e1084640bd60a0/image-19.jpg)
3. Complex Ions • Complex Ions ▫ Metal ions can act as Lewis acids and form complex ions with Lewis bases in the solvent.
![4. Amphoterism ▫ Amphoteric metal oxides and hydroxides are soluble in strong acid or 4. Amphoterism ▫ Amphoteric metal oxides and hydroxides are soluble in strong acid or](http://slidetodoc.com/presentation_image_h2/4f61c64831adf425b9e1084640bd60a0/image-20.jpg)
4. Amphoterism ▫ Amphoteric metal oxides and hydroxides are soluble in strong acid or base, because they can act either as acids or bases. ▫ Examples of such cations are Al 3+, Zn 2+, and Sn 2+
![Complex Ions Cont. • The formation of these complex ions increases the solubility of Complex Ions Cont. • The formation of these complex ions increases the solubility of](http://slidetodoc.com/presentation_image_h2/4f61c64831adf425b9e1084640bd60a0/image-21.jpg)
Complex Ions Cont. • The formation of these complex ions increases the solubility of these salts.
![Precipitation and Separation of Ions Precipitation and Separation of Ions](http://slidetodoc.com/presentation_image_h2/4f61c64831adf425b9e1084640bd60a0/image-22.jpg)
Precipitation and Separation of Ions
![Will a Precipitate Form? • In a solution, ▫ If Q = Ksp, the Will a Precipitate Form? • In a solution, ▫ If Q = Ksp, the](http://slidetodoc.com/presentation_image_h2/4f61c64831adf425b9e1084640bd60a0/image-23.jpg)
Will a Precipitate Form? • In a solution, ▫ If Q = Ksp, the system is at equilibrium and the solution is saturated. ▫ If Q < Ksp, more solid will dissolve until Q = Ksp. ▫ If Q > Ksp, the salt will precipitate until Q = Ksp.
![Sample Calculation • The Ksp for Ba. SO 4 is 1. 1 x 10¯ Sample Calculation • The Ksp for Ba. SO 4 is 1. 1 x 10¯](http://slidetodoc.com/presentation_image_h2/4f61c64831adf425b9e1084640bd60a0/image-24.jpg)
Sample Calculation • The Ksp for Ba. SO 4 is 1. 1 x 10¯ 10 and that for Ba. Se. O 4 is 2. 8 x 10¯ 11. A 1. 0 M solution of Ba. Cl 2 is added slowly to a solution that is 1. 0 x 10¯ 4 M in sodium sulfate, Na 2 SO 4 and 1. 0 x 10¯ 4 M in sodium selenate, Na 2 Se. O 4. What is the approximate percentage of one anion has precipitated at the point which the second anion just begins to precipitate? (Assume the addition of the Ba. Cl 2 solution does not change the overall solution volume to any significant degree. )
![Solution Solution](http://slidetodoc.com/presentation_image_h2/4f61c64831adf425b9e1084640bd60a0/image-25.jpg)
Solution
![Selective Precipitation of Ions One can use differences in solubilities of salts to separate Selective Precipitation of Ions One can use differences in solubilities of salts to separate](http://slidetodoc.com/presentation_image_h2/4f61c64831adf425b9e1084640bd60a0/image-26.jpg)
Selective Precipitation of Ions One can use differences in solubilities of salts to separate ions in a mixture.
![Selective Precipitation Practice Problems • Visit the website and walk through the sample calculations Selective Precipitation Practice Problems • Visit the website and walk through the sample calculations](http://slidetodoc.com/presentation_image_h2/4f61c64831adf425b9e1084640bd60a0/image-27.jpg)
Selective Precipitation Practice Problems • Visit the website and walk through the sample calculations • Try to solve the problem on your own and then walk through the worked out solution • http: //www. chemteam. info/Equilibrium/Selecti ve. Precip. html
![Practice Problems Ch. 17 49, 51, 53, 55, 57, 59 69, 70, 75, 76 Practice Problems Ch. 17 49, 51, 53, 55, 57, 59 69, 70, 75, 76](http://slidetodoc.com/presentation_image_h2/4f61c64831adf425b9e1084640bd60a0/image-28.jpg)
Practice Problems Ch. 17 49, 51, 53, 55, 57, 59 69, 70, 75, 76
![Closure • Which problem did you find most challenging today? Closure • Which problem did you find most challenging today?](http://slidetodoc.com/presentation_image_h2/4f61c64831adf425b9e1084640bd60a0/image-29.jpg)
Closure • Which problem did you find most challenging today?
- Slides: 29