Apparatus :
* Furnace
* Whatman Filter paper No – 42
* Silica Crucible
* Funnel
Procedure :
* Take 20 ml of aerated sample and filter it through Previously weighed whatman paper No – 42
* Wait for complete filtration by giving 2-3 washings with distilled water.
* After complete filtration keep the paper in oven at 1000C for [....]
