76 Preparation of Substances 



QUESTIONS 



(To be answerd in the notebook.) 



5. What amounts of copper sulfate and lime-water 

 did you use in making your Woburn Bordeaux? 



6. How many times as much copper sulfate is used 

 for ordinary Bordeaux as for the Woburn mixture? 

 How does the ordinary Bordeaux mixture differ in 

 composition from Woburn? 



7. Give a definition for a basic salt. 



8. How may one test for copper? 



9. What is meant by the expression 4-4-50? 



10. The symbol for the compound (I) CuS04-3CuO 

 may be written 4CuO*S03. Re^vrite (H), (HI) and 

 (IV) in a similar manner. Underscore the least basic 

 of these compounds. Double underscore the basic 

 part of this compound. 



11. What is the use of Bordeaux mixture? How 

 does it act? 



12. Figure the amount of calcium sulfate produced 

 when the Bordeaux is made using the ratio, IOCUSO4: 

 8CaS04, in the equation given in the notes. At a 

 volum of 800 cc. what is the maximum amount that 

 could dissolv? How much would be left undissolvd? 

 Is the undissolvd portion present in Bordeaux mixture? 



13. How much lime is used in this experiment? 

 How much is used in the reaction? How much dis- 

 solvs in water? What becomes of the remainder? 



14. What substances are in the solid part of the 

 Bordeaux? What substances are in. solution? 



15. Did you observ the formation of a thin white 

 scum on the surface of the ordinary Bordeaux? Ex- 

 plain what it is and how it was formd. Write the 

 equation showing its formation. 



16. What substances cause the copper to dissolv 

 from the Bordeaux mixture? 



