Sulfate of Ammonia 19 



7. What is the use of the Ume in the distillatioD of 

 gas hquor? 



8. Explain the presence of ammonium carbonate in 

 gas hquor. 



9. Why is commercial sulfate of ammonia brown? 

 10. Why does a brown substance sometimes settle 



out during the concentration of the ammonium sul- 

 fate solution? 



