Unit 7/8:
Equilibrium
Goals of Units 7 and 8 Include:
Explain how K describes a system at equilibrium
Use K values (Ka, Kb, Ksp, etc.) and concentration information to solve equilibrium problems (i.e. determine the pH of a weak acid solution) AND use concentration information to solve for K values.
Explain the components of a buffer system, describe how to create a buffer, and predict how a buffer changes upon the addition of acids or bases
Explain how weak acid/base titrations are different from strong acid/base titrations, including describing what's in the flask at various points in a weak acid/base titration
Explain how using the value for Q allows you to predict an equilibrium position shift
Manipulating reactions a la Hess' Law, but using K values instead
Equilibrium Outline
Because this is such a big hoobie beast unit, we will be following the outline below. Primary Topics are Primary Topics for a reason - they are our most FUNDAMENTAL concepts. Secondary Topics are next - these are important as well, but not as critical. And the Final Topics are the "nice to know" ideas.
- Introduction to Equilibrium
Reading assignment
- Primary Topics
Writing equilibrium expressions
Problem Set #1
Calculating K from concentration information
Calculation concentration/pH from K
Problem Set #3
- Secondary Topics
Common Ions
Problem Set #4
Buffers
Definition
Henderson-Hasselbach equation
Preparation of a buffer
Problem Set #5
Weak Acid/Strong Base OR Strong Acid/Weak Base titrations
Half-equivalence point
Calculations of pH
Problem Set #6
- Final Topics
Reaction Quotient, Q
Problem Set #7
LeChâtelier’s Principle
Manipulating K
Problem Set #8
Factors affecting solubility of insoluble salts
Problem Set #9 – Practice FRQ