More of Janice VanCleave's Wild, Wacky, and Weird Chemistry Experiments by Janice VanCleave

Author:Janice VanCleave [VanCleave, Janice]
Language: eng
Format: epub
Publisher: The Rosen Publishing Group, Inc

A OR B?

PURPOSE To identify the presence of an acid or a base in different materials.

MATERIALS measuring spoon

cabbage indicator (from previous experiment)

white saucer

testing materials (1 teaspoon [5 ml] of each):

grapefruit juice

orange juice

lemon juice

baking soda

tap water

paper towels

PROCEDURE

1. Place 2 tablespoons (15 ml) of the cabbage indicator in the saucer.

2. Add the grapefruit juice to the cabbage indicator.

3. Observe any color change in the cabbage indicator.

4. Repeat steps 1 through 3 for each of the 3 remaining testing materials, rinsing and drying the saucer thoroughly before each test.

RESULTS All of the materials produce a pink-to-red color, except baking soda, which produces a green color.

WHY? The cabbage indicator always changes to the same colors in the presence of an acid or a base. The green color produced by baking soda indicates that it is a base. The red tones produced by the other materials indicate that they are acids.

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