1. Use the Bronsted-Lowry theory to classify substances as acids or bases and identify conjugate acid-base pairs in chemical reactions.
2. Define amphoteric substance and give examples.
3. Calculate an acid dissociation constant, Ka, and a base dissociation constant, Kb, from concentration and pH measurements of weak acids or bases.
4. Use Ka or Kb to determine the pH of a solution.
Here is a brief overview of the Bronsted-Lowry theory:
It is typical to ask questions identifying the Bronsted-Lowry acid & base as well as the conjugate acid-base pairs. The following video continues with this aspect of the Bronsted-Lowry theory:
A topic for a more advanced students (in the AP range) examines weaker acids and bases. Since they do not ionize (or dissociate) completely in water, the equilibrium constant expression can be applied here to form Ka or Kb. Here is one problem solving session:
Here is a short table with Ka values:
This is longer, but provides a little review of writing acid-base reactions:
This provides a little Bronsted-Lowry review and answers at the end:
Typical labs during an acid-base unit are titration -- I will talk about acid-base titration next week.
Check out my lab book "Chemistry on a Budget" at amazon.com:
Each lab is presented with two possible report formats -- both labs use the same procedure page but each has a different conclusion page -- one with 10 questions to be answered as a conclusion, the other with a full laboratory report required. This gives the teacher the option of what type of report is desired!
I have a few links listed under Teaching Resources that could be very useful -- if you haven't checked it out, the link is at the top of this page! I just added one that has several Powerpoint presentations that you might find useful.
*I'd love to hear from you! Your feedback would really help me to focus on your needs. You might have had a school vacation around now -- take advantage of the time and write me about your classroom experiences! There should be a "Contact" form below, or click on the "Contact" tab on the top right of this page.
Have a good end of the week!