Study how the concentration of acids in various consumer beverages may be determined by titration with sodium hydroxide. Students will determine the proper indicator to use in the titration of a weak acid. Students will create an experiment to calculate the molar concentration of acid in a beverage. The activity contains enough materials for 15 groups of students as well as a Teacher’s Guide and Student Study Guide Copymasters. This lab meets Big Idea 1, Investigation 4, Primary Learning Objective 1.20.

Kit Includes:
10g Potassium Hydrogen Phthalate
4 x 25g Sodium Hydroxide
100mL Hydrochloric Acid, 0.1M
100mL Acetic Acid, 0.1M
500mL Sodium Hydroxide, 0.1M
25mL Phenolphthalein, 1%
25mL Methyl Red, 0.02%
25mL Bromothymol Blue, 0.04%
1 x pH Strips 1-14 Pkg/100

**Materials needed but not supplied:
Buret, 50mL
Lab Stands with Clamps
10mL Volumetric Pipettes
25mL Volumetric Pipettes
Test Tubes Test
Tube Racks
Pipette Bulbs or Pi-Pumps
Various Erlenmeyer Flasks
Various Graduated Cylinders
Distilled or Deionized Water
Wash Bottles
Electronic Balance, 0.001g resolution or better (optional)