19. The acidic or basic nature of a substance is tested by using an ......
a. Indicator b. Cell c. Battery d. Salt
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Litmus is extracted from lichens. It has a mauve (purple) colour in distilled water. When added to an acidic solution, it turns red and when added to a basic solution, it turns blue. So, it is used to test the acidic or basic nature of solutions.
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Answer:
The acidic or basic nature of a substance is tested by using an Indicator.Indicators are substances that change colour when they are added to acidic or alkaline solutions.Litmus,Phenolphthalein and Methyl Orange are all indicators that are commonly used in laboratory.
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