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Indicators from Natural Sources

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

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Indicators from Natural Sources

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  1. By Mitchell Loop & Alison Parrott Mrs. La Salle Period 6 Indicators from Natural Sources

  2. 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.

  3. 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

  4. 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.

  5. 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

  6. 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.

  7. 5. Repeat step 4 for household items such as table salt, toothpaste, mouthwash, shampoo, laundry detergent, dish detergent etc.

  8. Results • Hot Sauce- “Tapatio”: 1 • Vinegar: 3 • Shampoo: 5 • Salt: 6 • Baking soda: 9 • Toothpaste: 10 • Ammonia: 11

  9. 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.

  10. 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.

  11. 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

  12. 4. Which group contains items used for cleaning or personal hygiene? - The group the contains products for cleaning and personal hygiene is the bases.

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