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APPARATUS AND REAGENTS 



Phenolphthalein. 

 Phosphorus. 

 Potassium bichromate. 

 Potassium hydroxide. 

 Potassium iodine. 

 Potassium nitrate. 

 Potassium neutral phosphate. 

 Potassium permanganate. 



Sodium carbonate. 

 Sodium chloride. 

 Sodium hydroxide. 

 Sodium nitrate. 



Soudan III. 

 Zinc. 



