Question

how to prepare a natural indicator​

Answer 1

Answer:

You will need

• Half a red cabbage

• Chopping board and knife

• Kettle (to boil water for the indicator)

• Two large bowls

• Strainer or colander

• Five clear cups or jars

To test

• Half a cup of lemon juice

• One teaspoon of laundry powder

• Half a cup of white vinegar

• Half a cup of tap water

• One teaspoon of bi-carb soda

Making your indicator:

• Finely chop the red cabbage on the chopping board.

• Place the chopped cabbage in a bowl.

• Boil the kettle and pour the hot water in the bowl until it just covers the cabbage.

• Stir a little bit and then leave for five to ten minutes. The colouring you can see in the water is your indicator!

• Place the strainer over the second large bowl and pour off the liquid.

• Throw your cabbage in the compost.

• Your indicator is now safely in your bowl.

Testing your chemicals

• Label your cups.

• Half fill cup with the test chemicals. Dissolve the laundry powder and bi-carb soda in a half a cup of water to make your solutions.

• Add a teaspoon of indicator to each cup and observe the changes in colour. See table below to determine the approximate pH of your substances.

Answer 2

Answer:

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We can prepare a natural indicator by this method :-

Materials You Will Need :-

• Red cabbage
• Blender or knife
• Boiling water
• Filter paper (coffee filters work well)
• One large glass beaker or another glass container
• Six 250 mL beakers or other small glass containers
• Household ammonia (NH3)
• Baking soda (sodium bicarbonate,(NaHCO3)
• Washing soda (sodium carbonate, Na2CO3)
• Cream of tartar (potassium bitartrate, KHC4H4O6)
• Antacids (calcium carbonate, calcium hydroxide, magnesium hydroxide)
• Seltzer water (carbonic acid, H2CO3)
• Muriatic acid or masonry's cleaner (hydrochloric acid, HCl)

Procedure :-

1. Chop the cabbage into small pieces until you have about 2 cups of chopped cabbage. Place the cabbage in a large beaker or other glass container and add boiling water to cover the cabbage. Allow at least 10 minutes for the color to leach out of the cabbage. Alternatively, you can place about 2 cups of cabbage in a blender, cover it with boiling water, and blend it.
2. Filter out the plant material to obtain a red-purple-bluish colored liquid. This liquid is at about pH 7. The exact color you get depends on the pH of the water.
3. Pour about 50–100 mL of your red cabbage indicator into each 250 mL beaker.
4. Add various household solutions to your indicator until it changes color. Use separate containers for each household solution—you don't want to mix chemicals that don't go well together.

And your Indicator is ready......

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-: Addition Information :-

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✒ What is an Indicator ?

A pH indicator is a halochromic chemical compound added in small amounts to a solution so the pH of the solution can be determined visually. Hence, a pH indicator is a chemical detector for hydronium ions or hydrogen ions in the Arrhenius model.

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