Question

name a natural indicator ​

Answer 1

★ Indicator :

Indicators are the chemical compounds that are used to find the :

1. Acidity
2. Basic
3. pH value
4. Neutral value

So ; accordingly , we can classify them as acids , bases and alkalies .

Indicators are divided into :

1. Natural
2. Synthetic

According to their manufacturing and also characteristics .

★ Natural Indicators :

• Natural
• No chemicals added .
• Eg :

1. Turmeric - Yellow - Acid . Red - Base .
2. China Rose / Hibiscus
3. Red cabbage

★ Synthetic :

• Chemically made .
• Eg :

1. Methyl Blue
2. Methyl Orange
3. Phenolphthalein

Answer 2

Question :

Name a natural indicator.

Answer:

$\huge\longrightarrow$ Turmeric

Additional Information :

• Indicators are substances that are used to test the acidic and basic nature of substances.

• They come in contact with the substance and change the colour of the substance by which we recognize either the substance is acidic or basic.

• Some indicators that are prepared from flowers, roots, stems and leaves are called natural indicators. Ex - litmus paper , china rose, turmeric paper etc.

• Some indicators that are prepared in the laboratories by using chemical compounds are called artificial indicators. Ex - methyl orange, phenolphthalein etc.

Let's learn few points about few natural indicators-

Litmus ( natural indicator )

• Litmus is either red or blue.

• Blue litmus turns red in acidic medium and red litmus turns blue in basic medium.

• Litmus is extracted from lichens.

Turmeric ( natural indicator)

• Turmeric is used as an indicator in the form of turmeric paper.

• In basic medium turmeric paper turns red.

• In acidic or neutral medium there is no change.