Summer Research Program for Science Teachers
Midwood High School
Acidic Apples Basic Belches
Unit Acids and Bases
Time allotment: At least 1 45 min period (can be modified for a double period)
Objectives: Students will be able to determine whether some common everyday consumables are acidic or basic.
** Previous days homework/extra credit have students bring in the substances to be tested.
Materials: pH probe and applicable software, phenolthalein, bromtymol blue, pH paper, red and blue litmus paper, methyl orange, 1M Hydrochloric acid, 1M Sodium hydroxide, burets, ring stands, clear cups/ 100 mL beakers, alcohol pads, squirt bottles with water (preferable deionized water), Samples to be tested (Orange juice, Apple juice, milk, Maalox, tumbs, sink water, bottled water, coke, pepsi, sprite, liquid soap, cranberry juice, punch mix, lemonade, tea, laundry detergent, bleech, ammonia, baby oil, Milk of magnesia, soy sauce, etc) Preprinted data sheets for students to record observations (1 for each group or 1 per student)
Do now: What is an acid? What is a base? List at least 3 things we use to determine whether a substance is an acid or base? How do we determine the concentration of an unknown acid or base? (Be sure students know the titration formula and how to use it)
Motivation: What do you think heartburn is? If you suddenly though you had heartburn and didnt have any money or means of obtaining over the counter products designed to treat hearthburn what would you possibly use to treat your hearburn?
S4b Demonstrates an understanding of the designed world
S4c Demonstrates an understanding of health
S4e Demonstrates an understanding of the impact of science
S5e Works individually and in teams to collect and share information and ideas