MakingpHindicator

MakingpHindicator - 4. Turn off the Bunsen burner and allow...

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Making a pH indicator from http://www.chemsoc.org/networks/learnnet/Word_files/Kev31-40.doc Introduction A pH indicator is a substance that has a different color when added to acid or alkali. In this experiment a pH indicator is made from red cabbage. What to record Record the color of the cabbage indicator in the three solutions. What to do 1. Boil about 100 cm 3 of tap water in a beaker. 2. Add three to four pieces of red cabbage to the boiling water. 3. Boil for about 5 min. The water should have turned blue or green.
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Unformatted text preview: 4. Turn off the Bunsen burner and allow the beaker to cool for a few minutes. 5. Place three test tubes in a rack. Half fill one with alkali, one with acid and one with deionised water. 6. Decant approximately 23 cm height of cabbage solution into each test-tube. Safety Wear eye protection. Questions 1. What color is the cabbage indicator when neutral? 2. What color is the cabbage indicator when alkali? 3. What color is the cabbage indicator when acid? Home...
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This note was uploaded on 11/09/2011 for the course CHEM 100 taught by Professor Sdfsdf during the Winter '08 term at BYU.

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