Chapter 6 Ions: Charged Particles in Solution 71 Copyright Goodheart-Willcox Co., Inc. May not be reproduced or posted to a publicly accessible website. Name ________________________________________________________________ Date ________________________ Period _______________ Activity D Lab: Molarity of Sweetened Tea Safety • Use caution in handling boiling water. • Wash hands before handling food products. • Clean all utensils after use. • Use small paper cups for tasting. Purpose Iced tea is a popular beverage choice throughout the United States. However, people differ in their preference of how sweet it should be. Through testing and evaluation, you and your classmates will decide which molarity of sweetened iced tea is preferred by your class as a whole. Equipment electronic balance 1000-mL beaker spoon Supplies sugar freshly brewed tea 7 3-ounce paper cups per lab group member Procedure 1. Calculate the mass of one mole of table sugar or sucrose (C 12 H 22 O 11 ). 2. Measure 500 mL of unsweetened tea in the 1000-mL beaker. 3. Calculate and mass the moles of sugar needed for your assigned variation. Variation 1: Prepare a 0.30 M solution of sweetened tea. Variation 2: Prepare a 0.25 M solution of sweetened tea. Variation 3: Prepare a 0.20 M solution of sweetened tea. Variation 4: Prepare a 0.15 M solution of sweetened tea. Variation 5: Prepare a 0.10 M solution of sweetened tea. Variation 6: Prepare a 0.05 M solution of sweetened tea. 4. Use a spoon to stir the sugar into the tea until the sugar is dissolved. 5. Label six of the paper cups for each lab group member with the numbers 1 through 6. Pour about 15 mL (1 tablespoon) of the appropriate tea variation into each cup. Fill the seventh cup for each group member with water. 6. Taste a sample of each tea. Record your description of the flavor of each sample in the data table. Be sure to rinse your mouth with water between samples. 7. Select the molarity you liked best. 8. Record the preferences of everyone in the class.