DIY Natural Indicator from Red Cabbage Prepare a red cabbage extr… - Vidyadip

Question

DIY Natural Indicator from Red Cabbage} Prepare a red cabbage extract and test the following substances: lemon juice, soap solution, toothpaste, vinegar and black tea.
(a) What colour does the red cabbage extract change to in each case?
(b) Based on your observations, how can you classify the substances as acidic or basic?

substance	Colour Change in Red Cabbage	Nature of the Substance
1. Lemon Juice
2. Soap Solution
3. Toothpaste
4. Vinegar
5. Black tea

✓

Answer

(a) Colour Change in Red Cabbage Extract

substance	Colour Change in Red Cabbage	Nature of the Substance
1. Lemon Juice	Reddish	Acidic
2. Soap Solution	Greenish-Yellowish	Basic
3. Toothpaste	Greenish-Blueish	Basic
4. Vinegar	Reddish	Acidic
5. Black tea	Reddish	Acidic

(b) Classifying Substances as Acidic or Basic
Acidic Substances: Turn red cabbage extract reddish. Examples are lemon juice, vinegar, and black tea.
Basic Substances: Turn red cabbage extract greenish-yellowish. Examples are soap solution and toothpaste.

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