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Jasmine Penaloza & Bria Flores Mrs. LaSalle Chemistry/Period 2 27 May 2013

Jasmine Penaloza & Bria Flores Mrs. LaSalle Chemistry/Period 2 27 May 2013. Determining Whether A Substance Is An Acid or Base After Reaction. The Purpose . To determine the measurements of the pH of various household items by using the natural indicator to make a pH scale. . The Materials .

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Jasmine Penaloza & Bria Flores Mrs. LaSalle Chemistry/Period 2 27 May 2013

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  1. Jasmine Penaloza & Bria FloresMrs. LaSalleChemistry/Period 227 May 2013 Determining Whether A Substance Is An Acid or Base After Reaction

  2. The Purpose • To determine the measurements of the pH of various household items by using the natural indicator to make a pH scale.

  3. The Materials • Knife • Red cabbage • 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. The Start of the Procedure • 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. • 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.

  6. 4. Pour your indicator to about 1-cm depth into each of three plastic cups. To one cup, add several drops of vinegar.

  7. 5. To the second cup, add a pinch of baking soda.

  8. 6. To the third cup, add several drops of ammonia. The resulting colors indicate pH values of about 3, 9, and 11, respectively. Place these colored positions on your pH scale.

  9. 7. Repeat Step 4 for household items such as table salt, lemon juice, shampoo, mouthwash, milk

  10. Conclusion • The color of the indicator at acidic was pink. The color of the indicator at neutral was light purple. The color of the indicator at basic was dark blue. • The chemical changes that were responsible for the color changes was a reaction between the indicator and various household materials. • Lemon juice and white vinegar are acidic. Milk, baking soda, and salt are neutral. Ammonia, mouthwash, and hand soap are basic. • The basic group contains items used for cleaning or for personal hygiene such as mouthwash and hand soap.

  11. In this lab, we learned how to measure the pH of various household materials by combining a natural indicator made from red cabbage and warm water and a household item. We also learned how to classify whether an item is acidic, neutral, or basic. I also learned what the difference is between an acid or a base. Lastly, we learned to identify an item on the pH scale because of its color change. California Standard Set 5 is Acids and Bases 5. d. students know how to use the pH scale to characterize acid and base solutions.

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