Question

Name a synthetic indicator which will give pink colour with soap solution.

Methyle orange

Litmus

China rose

Phenophthalein​

Answer 1

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A synthetic indicator which will give pink colour with soap solution is Phenolphthalein Solution. It is because soap is a base and when a base reacts with Phenolphthalein solution the colour of Phenolphthalein solution turns into pink.

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$\longrightarrow$What are indicators?

✓ Indicators are the substance which change their colour in acidic and basic medium accordingly when reacted.

$\longrightarrow$ Names of some indicators and their change in colour in acidic and basic medium are as follows:-

✓ Litmus

Acid - Red Base - Blue.

A red Litmus solution changes into blue when reacted with base. A blue Litmus solution changes into red when reacted with acid.

✓ Methyl Orange Solution

Acid - Red Base - Yellow.

The methyl orange solution changes its colour to red in acidic medium and to yellow in a basic medium.

✓ Phenolphthalein Solution

Acid - Colourless Base - Pink

There is no reaction on Phenolphthalein solution when reacted with acid but it changes its colour to pink when reacted with bases.

✓ Turmeric Powder

Acid - No change Base - Red

The colour of turmeric doesn't change in acidic medium while it turns red in basic medium.

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$\longrightarrow$ What are olfactory indicators?

✓ The indicators which show change in odour when reacted with acid and bases are known as olfactory indicators.

Some Examples:-

✓ Onion

Acid - No change in odour Base - odourless

The smell of onion disappears when reacted with bases but remains same when reacted with acids.

✓ Vanilla Essence

Acid - No change in odour Base - Odourless

The smell of vanilla disappears when reacted with bases but remains the same when reacted with acids.

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Answer 2

Answer:

phenopthalene solution will give pink colour with soap solution