Identify the following solutions, whether they are acidic or alkali. Solution Change in indicator Acid/ Base Litmus Phenolphthalein Methyl orange 1. ___ No change ___ 2. ___ ___ Orange colour turns red 3. Red litmus blue ___ ____

Phenolphthalein and methyl orange are synthetic indicators and the litmus indicator is a natural indicator obtained from lichens. They show different observations in acidic or basic solutions. Therefore, the given table can be completed as, Solution Change in indicator Acid/ Base Litmus Phenolphthalein Methyl orange 1. Blue litmus red No change Orange colour turns red Acid 2. Blue litmus red No change Orange colour turns red Acid 3. Red litmus blue Pink Yellow Base

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General Science>Chapter 12 - Introduction to Acid & Base>Can you tell?>Q 4

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Important Questions on Introduction to Acid & Base

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General Science>Chapter 12 - Introduction to Acid & Base>Use your brain power

The iron knife shines better after cutting the sour fruits like lemon, raw mangoes. Why?

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8th Maharashtra Board

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General Science>Chapter 12 - Introduction to Acid & Base>Exercises>Q 1

Identify the following solutions, whether they are acidic or alkali.

Solution	Change in indicator			Acid/ Base
Solution	Litmus	Phenolphthalein	Methyl orange	Acid/ Base
1.	___	No change	___
2.	___	___	Orange colour turns red
3.	Red litmus blue	___	____