58 Preparation of Substances 



t 



5. What dilution for summer spray? Resulting 

 density? 



6. What change was observd when lead arsenate 

 was mixt with the summer spray? What new in- 

 soluble substance was formd? 



7. What is the per cent of sulfur in the lime-sulfur 

 you made? 



8. What substances are in lime-sulfur? Under- 

 score the one present in largest quantity. 



9. What is in the sediment in lime-sulfur? 



10. Write the reactions that take place when the 

 lime-sulfur is made, placing the name of each substance 

 under its symbol. 



11. Similarly write the series of reactions that take 

 place when lime-sulfur is oxidized. 



12. What effect on the composition of lime-sulfur 

 has long boiling? The concentration below 200 cc? 



13. What are the uses of lime-sulfur? 



14. What is said to be the action of lime-sulfur 

 in killing San Jose scale? 



15. What are the final products of oxidation of 

 lime-sulfur? 



16. A barrel of lime-sulfur was left half full over one 

 season. What substances would be found in the 

 crust that formd on the liquid? 



17. What specific gravity is equivalent to 33 B^.? 



18. What are the ordinary impurities in lime? 



19. Write the reaction for slaking lime. 



20. How many grams of slaked lime can be made 

 from 40 grams of quicklime? 



