MAGNESIUM AND ZINC. IONIC EQUILIBRIA 465 



of magnesium carbonate; (d) the precipitation of magnesium 

 hydroxide from the sulphate; (e) the hydrolysis of magnesium 

 chloride. 



5. Why is salt containing magnesium chloride, after mixing 

 with sodium bicarbonate, no longer deliquescent? 



6. What is the density of zinc vapor (air =1)? 



7. Make equations for: (a) the action of hydrogen sulphide on 

 zinc oxide; (b) the precipitation of zinc hydroxide; (c) the action 

 of sodium hydroxide on zinc hydroxide. 



8. What will be the effect of adding a concentrated solution 

 of silver nitrate to a saturated solution of silver sulphate (see 

 table of solubilities)? 



9. Write full ionic equations for the reactions mentioned on p. 

 463. 



