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Question 21 (4 marks) (a) Outline a suitable method to prepare a natural indicator - HSC - SSCE Chemistry - Question 21 - 2015 - Paper 1
Question 21
Question 21 (4 marks) (a) Outline a suitable method to prepare a natural indicator. .................................................................................. show full transcript
Worked Solution & Example Answer:Question 21 (4 marks) (a) Outline a suitable method to prepare a natural indicator - HSC - SSCE Chemistry - Question 21 - 2015 - Paper 1
Step 1
Outline a suitable method to prepare a natural indicator.
Answer
To prepare a natural indicator, follow these steps:
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Select Plant Material: Collect a colored plant material, such as red cabbage.
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Prepare the Plant: Cut the colored parts of the plant into small pieces.
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Boil in Water: Place the cut pieces in a beaker with water and boil until the water becomes colored.
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Cool the Mixture: Allow the mixture to cool after boiling.
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Decant the Liquid: Carefully decant the liquid into a container, leaving the solid plant material behind.
Step 2
How could a natural indicator be tested?
Answer
To test a natural indicator, perform the following:
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Prepare Test Samples: Add some of the natural indicator to separate test tubes containing known acidic and basic solutions.
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Observe Color Change: Record the color of the natural indicator in each solution.
This activity will show the different colors produced by the indicator in acidic versus basic environments.