Indicators from Natural Sources
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INDICATORS FROM NATURAL SOURCES By Mitchell Loop & Alison Parrott Mrs. La Salle Period 6
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By Mitchell Loop & Alison Parrott Mrs. La Salle Period 6. Indicators from Natural Sources. Purpose. The purpose of the lab is to measure the pH value of various household materials by using a natural indicator to make an indicator chart. . Materials. Knife Red cabbage leaves 1-cup measure - PowerPoint PPT Presentation
Transcript of Indicators from Natural Sources
INDICATORS FROM NATURAL SOURCES
By Mitchell Loop & Alison ParrottMrs. La Salle
Period 6
Purpose The purpose of the lab is to measure the
pH value of various household materials by using a natural indicator to make an indicator chart.
Materials Knife Red cabbage leaves 1-cup measure Hot water 2 jars Clean white cloth Teaspoon Tape 3 sheets of plain white paper Pencil Ruler 10 clear plastic cups White vinegar Baking soda Household ammonia Dropper Various household items
Procedure 1. Put ½ cup of finely chopped red
cabbage leaves in a jar and add ½ cup of hot water. Stir and crush the leaves with a spoon. Continue the extraction until the water is distinctly colored.
2. Strain the extract through a piece of cloth into a clean jar. This liquid is your natural indicator.
3. Tape three sheets of paper end to end. Draw a line along the center and label it at 5-cm intervals with the numbers 1 to 14. This is your pH scale.
4. Pour your indicator to about 1-cm depth into each of three plastic cups. To one cup, add several drops of vinegar, to the second add several drops of ammonia
4. Pour your indicator to about 1-cm depth into each of three plastic cups. To one cup, add several drops of vinegar, to the second add several drops of ammonia, and to the third add a pinch of baking soda. The resulting colors indicate pH values of 3, 9, and 11. place the cups on your pH scale.
5. Repeat step 4 for household items such as table salt, toothpaste, mouthwash, shampoo, laundry detergent, dish detergent etc.
Results Hot Sauce- “Tapatio”: 1 Vinegar: 3 Shampoo: 5 Salt: 6 Baking soda: 9 Toothpaste: 10 Ammonia: 11
Analyze and Conclude 1. What was the color of the indicator at
acidic, neutral, and basic conditions?- The acidic indicator was red, the neutral
indicator was green, and the basic indicator was blue.
2. What chemical changes were responsible for the color changes?
- The chemical changes that were responsible for the color changes were the changes to acid or to base.
3. Label the materials you tested as acidic, basic, or neutral.
- Hot sauce: acidic- Vinegar: acidic - Salt: slightly acidic- Baking soda: slightly basic- Toothpaste: basic- Ammonia: basic
4. Which group contains items used for cleaning or personal hygiene?
- The group the contains products for cleaning and personal hygiene is the bases.
