A YEAR IN SCIENCE 59 



Exercise 33. Nitrogen. 



Object: To determine some of the properties of 

 nitrogen. 



Apparatus 



Ammonium chloride Bunsen burner 



Sodium nitrite Wire gauze 



Flask Wide mouth bottles 



Rubber stopper Glass plates 



Delivery tube Pine splinter 



Pneumatic trough Thistle tube 

 Ring stand 



Directions : Place 8 grams of sodium nitrite, 3 grams 

 of ammonium chloride, and 15 c.c. of water in the flask. 

 Into the mouth of the flask insert a rubber stopper, 

 fitted with a thistle tube and a delivery tube. Place 

 the flask on the wire gauze over the Bunsen flame. Heat 

 gently and allow the first gas to escape. Fill several 

 bottles with water, and invert them in the water in the 

 pneumatic trough. Fill the bottles with the gas from 

 the flask by doAvnward displacement of water. The 

 gas given off is nitrogen. Examine a bottle of nitro- 

 gen. Has it color? Odor? 



Into a second bottle of nitrogen insert a lighted 

 splinter. Does the splinter continue to burn? Does 

 the nitrogen burn? 



What are the properties of nitrogen? 



