210 SMITH'S INTERMEDIATE CHEMISTRY 



4. Why does hydriodic acid, when left in the air, become brown 

 in color? 



5. Make a list of all the acids we have encountered, and note 

 which are weak and which strong. 



6. How should you make potassium bromide, starting with, (a) 

 potassium and bromine, (6) hydrogen bromide, (c) potassium 

 iodide? 



7. Rewrite the equation for the action of hydrobromic acid 

 on silver nitrate solution in full ionic form. 



