1. Drill
What ion is lost by an acid?
What ion is gained by a base?

2. Objective: The student will be able to:
Complete a lab activity in order to compare and contrast the pH of weak and strong acids and bases.

3. SAT Enrichment Define Volatile:
Evaporating readily at normal temperatures and pressures

4. Quiz Time
5 min
SHORT QUIZ

5. Quick Lab 20 min Place in bin when finished! Purpose
To measure the pH of various household materials by using a natural indicator to make an indicator chart
20 min
Place in bin when finished!

6. Drill
Pull out a blank sheet of paper to take notes.
Sit quietly!

7. Strengths of Acids and Bases
How Strong are they??

8. Strengths of Acids and Bases
Lemons and grapefruits have a sour taste because they contain citric acid. Sulfuric acid is a widely used industrial chemical that can quickly cause severe burns if it comes into contact with skin. You will learn why some acids are weak and some acids are strong.

9. Strong and Weak Acids and Bases
An acid dissociation constant (Ka) is the ratio of the concentration of the dissociated (or ionized) form of an acid to the concentration of the undissociated (nonionized) form.
Weak acids have small Ka values. The stronger an acid is,
the larger is its Ka value.

10. Strong and Weak Acids and Bases
Strong acids are completely ionized in aqueous solution.
Weak acids ionize only slightly in aqueous solution.

11. Strong and Weak Acids and Bases
In general, the base dissociation constant (Kb) is the ratio of the concentration of the conjugate acid times the concentration of the hydroxide ion to the concentration of the base.
Strong bases dissociate completely into metal ions and hydroxide ions in aqueous solution.
Weak bases react with water to form the hydroxide ion and the conjugate acid of the base.

12. Strong and Weak Acids and Bases

13. Strong and Weak Acids and Bases
Dissociation Doc

14. Calculating Dissociation Constants
To find the Ka of a weak acid or the Kb of a weak base, substitute the measured concentrations of all the substances present at equilibrium into the expression for Ka or Kb.

15. Exploring pH
Purpose:
Compare and contrast the pH of weak and strong acids and bases.
You will have 30 min to complete the lab activity.
Once you are finished clean up and return to your seats and complete the analysis questions.

16. Summary Did we accomplish our objective?
Compare and contrast the pH of a Strong acid and Weak Acid.
Compare and contrast the pH of a Strong base and Weak base.
According to the pH determined for ammonia, ammonia is an acid or base? How about vinegar?
How could you use pH testing at home?

17. Homework Read the Neutralization Lab for tomorrow.
If you have any questions about the lab put the questions on the lab worksheet.
Be ready for a short pre-lab Quiz.