Chemistry
Chemistry 17: 5-7
Homework
Common Ions
Chapter 17: 5-7 Homework
- Reading Preparation
- WebLecture
- Study Activity
- Preparation work for chat
- Online Quiz
- Lab Instructions
Reading Preparation
Textbook assignment: Read Kotz and Triechel, Chemistry and Chemical Reactivity Chapter 17: Sections 5 to 7.
Study Notes
- 17.5 We can now define a new "special value" for Q. The value of Q at the point at which a reaction reaches saturation is the solubility equilibrium constant Ksp. If Q < Ksp, the solution is not yet saturated. If Q > Ksp, the solution is supersaturated and will precipitate. We can use the relationship between Q (the quotient at an time) and Ksp to predict the outcome of a reaction.
- 17.6 When complex ions are involved in a solution equation, the formation of the ion can be identified by yet another "special Q", Kf, the equilibrium constant for the formation of the ligand bonds with the metal ion.
- 17.7 The relationship of solubility and formation constants determine whether a solid will dissociate in a given solvent. The small solubility value of a solute in water indicates that it does not dissolve, but if one of the solute components will form a complex ion with another molecule, the solute will dissolve in a solvent containing that molecule.
Key Formula
| Principle | Formula | Notes |
|---|---|---|
| Q and K in precipitation reactions |
Q = Ksp: solution is saturated.
Q < Ksp: solution is not saturated Q > Ksp: solution is oversaturated, precipitation will occur |
Web Lecture
Read the following weblecture before chat: Complex Ions and Precipitation
Study Activity
Videos for Chapter 17: Principles of Chemical Reactivity: Other Aspects of Aqueous Equilibri
Review the Videos at Thinkwell Video Lessons.
- Under "EQUILIBRIUM IN AQUEOUS SOLUTIONS"
- Solubility Equilibria
- Fraction Precipitation
- Solubility Equilibria
Use the Solution Simulation below to explore saturation. Under what conditions will a solute dissolve? Under what conditions will it precipitate back out of the solution?
Chat Preparation Activities
- Essay question: The Moodle forum for the session will assign a specific study question for you to prepare for chat. You need to read this question and post your answer before chat starts for this session.
- Mastery Exercise: The Moodle Mastery exercise for the chapter will contain sections related to our chat topic. Try to complete these before the chat starts, so that you can ask questions.
Chapter Quiz
- Required: Complete the Mastery exercise with a passing score of 85% or better.
- Go to the Moodle and take the quiz for this chapter.
(Aligns to) AP #14 GUIDED INQUIRY — Creating an effective buffer solution — Phase III
Complete your data analysis and file your formal report.
Resources:
- APGIE Investigation 16 Buffer Design: The Preparation and Testing of an Effective Buffer: How Do Components influence a Buffer’s pH and Capacity?
- IGHCE Lab 13.2 Quantify the common ion effect
- There is no alternate form for this lab
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