CHLORINE. CALCULATIONS 151 



Before calculating the volume (gaseous) of a substance repre- 

 sented in an equation, consider whether it is a volatile substance. 

 Only volumes of gases can be calculated by the rules given above, 



Exercises. 1. What would be the results of electrolyzing 

 aqueous solutions of: (a) potassium chloride; (b) cupric chloride 

 (cf. p. 54). 



2. How should you separate the chlorine and the steam pro- 

 duced by Deacon's process? 



3. Make equations showing the interactions with hydrochloric 

 acid of: (a) manganese dioxide; (b) potassium chlorate; (c) 

 red lead. The metals form MnCl 2 , KC1, and PbCU, respectively. 



4. What would be the pressure in a cylinder of liquid chlorine 

 at 20? 



5. Make equations for the union of chlorine with: (a) copper; 

 (b) sodium; (c) iron; (d) phosphorus; (e) sulphur. 



6. When plunged into chlorine, a jet of illuminating gas con- 

 tinues to burn. A stream of soot rises from the flame, however, 

 and blowing the breath into the jar, afterwards, produces a fog. 

 What do you infer as to the constituents of illuminating gas? 



7. What information is conveyed by the fact that the formula 

 of the chloride of sulphur is written S 2 C1 2 , and not SCI? 



8. Make the molecular equation for the action of sodium upon 

 hydrogen chloride (p. 131). Why does not the mercury interact 

 with the latter (cf. p. 54)? 



9. What facts led us, in Chap. VIII, to the conclusion that the 

 molecular weight of chlorine was 70.92 while its atomic weight 

 was 35.46? 



10. What are the relative densities (p. 85) of: (a) oxygen and 

 chlorine; (b) hydrogen and hydrogen chloride; (c) hydrogen and 

 air; (d) acetylene C 2 H 2 and air? 



11. What volume of hydrogen chloride at and 760 mm. is 

 obtained by the interaction of 65 g. of sodium chloride, and an 

 excess of sulphuric acid (p. 126)? 



