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Jh^ CAUTION Always wear safety ^^ goggles and a lab apron to protect your eyes and clothing. Put on safety goggles and a lab apron.

A CAUTION Use tongs or a hot mitt to ^ ▼ handle heated glassware. Put 18 g of regular (1.8 g of sugar-free) instant gelatin in a 150 mL beaker. Slowly add 50 mL of boiling water to the beaker, and stir the mixture with a stirring rod. Test and record the pH of this solution. ^^ CAUTION Do not touch or taste any ^^ chemicals. Very slowly add 0.7 g of Na2CO3 to the hot gelatin while stirring. Note any reaction. Test and record the pH of this solution.

W CAUTION Glassware is fragile.

^ ' Notify the teacher of broken glass or cuts. Do not clean up broken glass or spills with broken glass unless the teacher tells you to do so. Remember to use tongs or a hot mitt to handle heated glassware. Place 6 test tubes in a testtube rack. Pour 5 mL of the gelatin-Na2CO3 mixture into each tube. Use a pipet to remove any bubbles from the surface of the mixture in each tube. Cover the tubes tightly with plastic wrap and tape. Cool the tubes, and store them at room temperature until you begin Part C. Complete step 11 in Part C.

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