Which is the correct observation when you drop a few drops of acetic to a test tube containing?

Phenolphthalein - Colourless

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Distilled water - Blue

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Universal indicator - Red

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Sodium hydrogen carbonates - Orange

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Solution

The correct option is B Phenolphthalein - Colourless
Phenolphthalein remain colourless as acetic acid shows a chnage in colour in basic substances.

Acetic acid dissolves in water.

Acetic acid turns the colour of universal indicator to pale orange

When a few drops of acetic acid will be added in sodium hydrogen carbonate, sodium hydrogen carbonate will give brisk effervescence due to the formation of $C O_{2}$ gas.

$C H_{3} C O O H + N a H C O_{3} ⟶ C H_{3} C O O N a + H_{2} O + C O_{2}$

This are the changes observed .

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Similar questions

What do you observe when you drop a few drops of acetic acid in a test- tube containing.

a) Phenolphthalein .

b) Distilled water

c) Universal indicator

d) Sodium hydrogen carbonate power.

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