Question

Draw a well labelled diagram of filter candle. Give its working and disadvantages.

Answer 1

Diagram :

Working  :

The filter candle is placed in a vessel containing the liquid to be filtered.

When vacuum is applied, the pressure inside the candle is decreased.

Due to the difference in external pressure & pressure inside the candle, the liquid move inside through thick wall of the candle and get collected inside the candle.

The filter candle can be blocked with continuous use. This can be cleaned by scratching the external surface with nail brush and passing water through it in the reserve direction.

Disadvantages  

1. Chance of clogging/blocking.

2. Traces of material may come in the solution.