Calculation of Chemical Oxygen Demand (C.O.D)
Apparatus:
Round bottom flask, water condenser, Burette, Pipette,Heating mantle.
Reagents:
* Mercuric sulphate (< 1gm)
* Sulfuric Acid (1 Kg H2SO4 + 5.5 gm Ag2SO4 ) dissolve for 24 hrs.
* 0.25 N Potassium Dichromate (12.259 gm K2Cr2O7 dried at [....]