Academic journal article Science Scope

Try This TOPS IDEA!

Academic journal article Science Scope

Try This TOPS IDEA!

Article excerpt

cabbage chemistry

...adapted from ANALYSIS #10 by TOPS Learning Systems

1. Boil red cabbage leaves in a little water, and save the blue water in a labeled dropper bottle.

2. Place 5-drop puddles of cabbage water on waxed paper; set on white paper. Mix a small pinch of a different powder sample into each puddle.

3. How does your cabbage-water indicator change color in the presence of an acid, base, or neutral solution?

4. Test whether these substances are acid, neutral, or base:

baking soda, alum, vinegar, garden lime, sugar, lemon juice, corn starch, ammonia...

[ILLUSTRATION OMITTED]

[c] 2009 by TOPS Learning Systems. Photocopies permitted if this notice appears. All rights reserved.

OBJECTIVE

To investigate the properties of cabbage water as an acid-base indicator.

LAB NOTES

Steps 3-4. Some degree of color blindness challenges some boys, so be sure each lab group includes at least one "color expert."

ANSWERS

3. The cabbage watercolor is: Pink-purple in the presence of an acid. Green-yellow in the presence of a base. Blue in the presence of a neutral solution.

4. Bases, baking soda, garden lime, ammonia Neutral Solutions: sugar, cornstarch Acids: alum, vinegar, lemon juice Bonus: Neutral to acidic beet juice remains red, but turns darker red-to-purple when basic. …

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