CHLORINE 37 



a. Open a bottle of concentrated hydrochloric acid, and blow 

 your breath over it; your mouth should be wide open. What 

 happens? The cloud or fog is composed of the moisture of 

 your breath and the gas that comes from the hydrochloric acid 

 of the bottle. Hold a piece of moist blue litmus paper over the 

 mouth of the bottle, and state the result. 



b. Open a bottle of concentrated ammonia water, and get its 

 odor. Hold a piece of moist red litmus paper in the gas (am- 

 monia) that comes out of the bottle; result? 



c. Wet a small strip of paper, such as blotting paper or filter 

 paper, with ammonia water, and hold it over the mouth of a 

 wide-mouth bottle into which you have poured a few drops of 

 concentrated hydrochloric acid. Result? The product is a 

 solid (ammonium chloride or sal ammoniac). 



Wet one side of a plate of glass with ammonia water, and lay 

 the glass, wet side down, over the bottle containing the few 

 drops of hydrochloric acid. Let the apparatus stand for some 

 time, and state the result. 



EXERCISE 36 

 CHLORINE 



Apparatus and Materials. Wide-mouth bottle, glass plate, man- 

 ganese dioxide, concentrated hydrochloric acid, litmus paper, colored 

 cloth, paper with ink writing, green leaves. 



NOTE: Chlorine is a dangerous gas to inhale in any con- 

 siderable amount, and should be made only under a fume 

 chamber or by an open window with an outgoing draft. The 

 window does very well. Probably it will be best for the teacher 

 or a few students to make a bottle of the gas and to show it 

 to the class. If you have breathed too much chlorine, smell 

 cautiously of the bottle of ammonia water. 



a. Into a wide-mouth bottle (Fig. 18) put about half a 



