Copyright Goodheart-Willcox Co., Inc. May not be reproduced or posted to a publicly accessible website. 76 Principles of Food Science Lab Manual 5. Record the color of each solution in your data table. 6. Lay the test tubes in order on a sheet of white paper. Part II 1. Use the wax pencil to label each of 13 clean test tubes with the name of one of the following substances: fruit juice, baking soda, buttermilk, milk, bleach, clear soda, egg white, dishwashing liquid, honey, lemon juice, milk of magnesia, tea, ammonia. 2. Measure 15 mL of each of the substances listed in Part II, step 1 into the appropriately labeled test tubes. 3. Add 10 mL of the natural indicator (red cabbage juice) to each test tube. Cover each test tube with a lid or stopper and shake gently to combine. 4. Match the color of the solution in each test tube to the color of the solution in the test tube prepared in Part I. Record the number of the test tube from Part I that is closest in color in your data table in the appropriate row for each substance. 5. Test the pH of each of the solutions prepared in Part II with a 1- to 2-inch piece of indicator paper or a pH meter. Record the pH reading in the appropriate row of the data table. 6. Combine the lemon juice and the baking soda test tubes, match the color, and test with pH paper or a pH meter. Record your observations in your data table. Pre-Lab Purpose: _____________________________________________________________________________________________________________________ _____________________________________________________________________________________________________________________ Procedure summary: _____________________________________________________________________________________________________________________ _____________________________________________________________________________________________________________________ Lab Data Part I Test Tube Number NaOH Acetic Acid Indicator Color 1 3 ml 10 ml 2 2 ml 10 ml 3 1 ml 10 ml 4 .5 mL 10 ml 5 1 drop 10 ml 6 10 ml 7 1 drop 10 ml 8 3 drops 10 ml 9 .5 ml 10 ml 10 1 ml 10 ml 11 2 ml 10 ml 12 3 ml 10 ml