- Indicators for both an acid and a base, must have clear color change differences for both. In this investigation, you will test your cabbage indicator paper with both a strong acid and a strong base.
MATERIALS NEEDED:
1 cabbage paper strip (prepared in experiment CABBAGE INDICATOR PAPER)
1 sheet notebook paper
1 sheet wax paper
Pencil
2 eyedroppers
vinegar
household ammonia
2 small baby food jarsPROCEDURE:
Fill one of the small jars one-quarter full with vinegar and place an eyedropper in it.
Fill the second jar one-quarter full with ammonia and place an eyedropper in the jar.
Place the notebook paper on the table, and lay the cabbage testing paper in the middle of the paper.
Write vinegar on the notebook paper at one end of the test strip, and ammonia at the other end.
Pick up the test strip and place the wax paper over the notebook paper. Put the test strip on the wax paper, between the labels you made on the notebook paper.On the end of the cabbage paper next to the vinegar label, place two drops of vinegar.Add 2 drops of ammonia to the opposite end of the cabbage paper labelled ammonia. RESULTS:
- Ammonia turns the paper green and vinegar produces a pink color.
- Cabbage testing paper is used to test for the presence of acids or bases. The chemicals in the cabbage juice always produce the same color changes. Bases change the paper to green, and acids produce a pink-to-red color. The cabbage paper in this lab indicates that ammonia is a basic chemical and that vinegar is acidic.
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- Ammonia turns the paper green and vinegar produces a pink color.
ACID-BASE TESTING
INTRODUCTION: