XVIII 



SALT 



265 



laboratory) to cover the oxide and see that the end of the 

 thistle funnel is below the level of the acid. Observe that a 

 (lurk greenish-brown liquid results. Warm and observe the 

 formation of a heavy green gas which may be collected in the 

 same manner as hydro- 

 chloric gas. 1 In this 

 manner fill five jars, and 

 close each jar tightly. 



(1) In the first jar 

 place some moist 

 coloured rags, orflowers, 

 and observe the bleach- 

 ing. Writing in ordin- 

 ary ink may also be 

 bleached. 



(2) Plunge in a lighted 

 taper and observe that 

 the taper burns, but 

 with the formation of 

 clouds of soot, and ob- 

 serve that water shaken 

 up in the jar becomes 

 acid. 



(3) Place in some 

 filter-paper moistened 

 with turpentine and 

 compare the result with 

 that obtained in the 

 previous experiment. 



(4) Place in the jar, 

 by means of a deflag- 

 rating spoon, some 



burning phosphorus, and observe it continues to burn with 

 the formation of white fumes. 



(5) Place in the gas some burning sodium, and see that it 

 also burns with the formation of white fumes. Dissolve these 

 fumes in water, and see that a solution of salt results. 



Pass the gas through water for a short time, and observe 

 that it is slightly soluble, the solution, known as chlorine 

 water, smelling of the gas. 



It is thus seen that sodium with this gas forms salt, and hence 

 1 The gas is best collected in the open air or in a draught cupboard. 



FIG* 133. Preparation of Chlorine. 



