Question

(a) What is an indicator? Name three common indicators.
(b) Name the acid-base indicator extracted from lichen.
(c) What colour does the turmeric paper turn when put in an alkaline solution?

Answer 1

a) An indicator is a dye that changes color when you put into an acid or a base solution. Litmus, Methyl orange and Phenolphthalein are the three common indicators.

b) Litmus is the acid-base indicator extracted from lichen.

c) The turmeric paper turns reddish in color when it is put in an alkaline solution.

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Answer 2

Turmeric Paper turns RED

Explanation:

(a) Indicators are substances that show a distinct change (colour or odour) simultaneous to a change in concentration of ions such as $H^+ \ and\ OH^-$ions.

Examples:

i.) Methyl orange

ii.) Phenolphthalein

III.) Litmus solution.

(b) A purple dye is extracted from a plant called lichen. This dye is called a litmus solution and is commonly used as an indicator.

(c) When turmeric paper is put into an alkaline solution, it turns red.