182 



CHART A 15. Potassium-sulphide Reactions. 



CHART A 16. Sodium-hydroxide Reactions. 



5 10 



I ' 6 



6 20 



R 35 



40 

 S 4S 

 E 50 



65 



1 10 



> 90 

 S 



e BO 

 I 70 



E 40 

 30 

 S 20 



