Question

How foam type fire extinguisher works? Why saponin is added to sodium bicarbonate?

Answer 1

Because as soponi reacts with sodium carbonate to from soap miclle to trapped fire that's why we use foam

Answer 2

Answer:

Saponin

Explanation:

The foam-type extinguisher consists of a metallic cylinder having a knob and a nozzle tube. The metallic cylinder is filled with a saturated solution of sodium bicarbonate. A glass bottle containing aluminium sulphate is kept inside the metallic cylinder.

When we strike the knob of the extinguisher against a hard surface, the glass bottle breaks and the aluminum sulphate comes in contact with the sodium bicarbonate and reacts with it to produce carbon dioxide.

A substance called Saponin is added to the solution of sodium bicarbonate to produce foam of carbon dioxide.

The foam of carbon dioxide out through the nozzle which is directed towards the fire.

Benefits:

• This type of fire extinguisher can be used safely.

Uses:

• Can be used to put out fires caused by burning of electric appliances.
• Can be used to put out fires caused by inflammable liquids such as petrol and keroscene oil.