HYDROCHLORIC ACID, CHLORIN, AND CHLORIDS 83 



the delivery tube B, and a tight-fitting cork, the Cl gas, when 



generated, passes into the large cylinder, in which has been placed 



a green leaf, a piece of colored cloth, and paper upon which is 



some writing. The delivery tube passes through the hole in the 



ground-glass plate, without any cork. To generate the chlorin, 



apply gentle heat to the flask, and 



as soon as the cylinder is nearly 



filled with the Cl gas, which can be 



observed by its color, remove the 



flame so as to prevent any of the 



gas from escaping into the room. 



Do not inhale any of the fumes, as 



they are irritating to the throat and 



lungs. Make the following tests : 



(i) Observe the effect which the A 

 chlorin gas has upon the cloth, 

 paper, and leaf. (2) To the cylin- 

 der, add 5 cc. water containing two 

 or three drops of indigo solution. 

 Observe the result. 



Questions. ( i ) Give the physical 

 properties of Cl gas, odor, weight, 

 and color. (2) What caused the 

 liberation of the Cl gas from the 

 H Cl ? ( 3 ) Write the reaction . ( 4 ) 

 What are some of the chemical 

 properties of chlorin as observed 

 from the changes which have taken place in the materials in the 

 cylinder? (5) What is a chlorid ? (6) Name five compounds con- 

 taining chlorin. (7) WhyisCl gas employed as a disinfectant? 

 Explain its action as a disinfectant. (8) What is bleaching-powder, 

 and how is it used as a disinfectant ? (9) NaCl is necessary for 

 animal life ; Cl is one of the elements of the compound ; Cl is de- 

 structive to animal life ; why can you not conclude that NaCl con- 

 taining Cl is destructive to animal life ? 



Fig. 41. Preparation of chlorin. 



