1. Pre-AP Chemistry 3.31.09  New Seating Charts  Go over Ch 19 Tests  Discuss calendar  Acid / Base In-class Activity in groups  Discuss analysis questions  Homework

2. Let’s see what you already know about acids and bases? Grab a clicker!

3. What do you already know about acids and bases?  If a solution has a pH of 4, the solution is…?  Acidic  Basic  neutral

4.  Pure water has a pH of…?  7  5  10

5.  What is the pH of your stomach acid?  7-9  3-4  1-2

6.  Which acid is in your stomach? a. HCl b. H 2 SO 4 c. HNO 3

7.  What acid is in Coke? a. Hydrochloric acid b. Phosphoric acid c. Acetic acid

8.  True / False Acids are more harmful than bases. a. True b. False

9.  In the movie “Fight Club”, what substances was used to ease the pain of Edward Norton's hand when lye was placed on it? a. Vinegar b. Water c. Battery acid

10.  Which acid is battery acid?  Nitric acid  Hydrochloric acid  Sulfuric acid

11.  Most household cleaners are…? a. Acidic b. Basic c. Neutral

12.  What acid is found in fruits? a. Citric acid b. Acetic acid c. Boric acid

13. Data and Analysis  Use your observations to group the test solutions into as many categories as are needed to account for similarities and differences in chemical reactivity. Be prepared to justify your classification scheme.  What strategy could you use to identify an unknown substance as an acid or a base.  A drop of bromthymol blue placed in an unknown solution turns yellow. Is this solution acidic or basic?  Why do you think universal indicator is called an indicator?  What ionic species is common among the group of compounds you categorized as acids? As bases?

14. Homework:  Read and take notes over Section 20.1 and 20.2  Naming Acids Wkst  Set up lab notebook  Moodle Reading Quizzes  Section 20.1 (includes in-class activity)  Due by Wed 12:15pm  Section 20.2  Due by Friday 3pm