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Cabbage juice lab

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  • 1. Cabbage Juice Lab Purpose:To test the pH of different solutions using cabbage juice.
  • 2. Why use cabbage juice?• By boiling the red cabbage leaves, we extracted a class of pigment molecules called anthocyanins into solution. Anthocyanin molecules will change their color depending upon the pH of their environment and can indicate the pH of a solution.
  • 3. What is pH?• The pH scale measures how acidic or basic a substance is.• It ranges from 0 to 14.• A pH of 7 is neutral.• A pH less than 7 is acidic, and a pH greater than 7 is basic.
  • 4. What should SOIL pH be to help plant growth?Most soils for plant If the pH of the soil is too growth should be acidic, this may slow around 6 to 7 (slightly down the acidic to neutral) for decomposition process optimal growth. If it is of bacteria. too acidic, lime can be added to raise the pH level.
  • 5. Investigation• Identify each solution as either an acid, base, or neutral.
  • 6. Solution 1 VinegarpH: 3-4 (acid)
  • 7. Solution 2 SodapH: 3 (acid)
  • 8. Solution 3 Tap WaterpH: 7 (neutral)
  • 9. Solution 4 Baking SodapH: 8-9 (base)
  • 10. Solution 5 MilkpH: 6 (acid)
  • 11. Solution 6Soapy WaterpH: 12 (base)
  • 12. Solution 7Lemon JuicepH: 2-3 (acid)
  • 13. Solution 8Hand SanitizerpH: 7 (neutral)

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