Answer the following:
1.What happened when you added HCl to the lead nitrate solution?
A. A yellow precipitate formed.
B. The solution turned white.
C. A white precipitate formed.
D. The solution turned yellow.
2. What happened to the lead chloride precipitate when heated to 100oC in water?
A. Nothing happened.
B. It turned white.
C. It dissolved.
D. It turned yellow.
3. What happened to the lead when potassium chromate was added?
A. Nothing happened.
B. A white precipitate formed.
C. A yellow precipitate formed.
D. A green precipitate formed.
4. What happened when you added HCl to the mercury nitrate solution?
A. A yellow precipitate formed.
B. The solution turned yellow.
C. The solution turned white.
D. A white precipitate formed.
5. What happened to the mercury chloride precipitate when heated to 100oC in water?
A. It turned yellow.
B. It turned white.
C. Nothing happened.
D. It dissolved.
6. What happened to the mercury chloride precipitate when you added ammonia?
A. It turned white.
B. It turned black.
C. It turned yellow.
D. It dissolved.
7. What happened when you added HCl to the silver nitrate solution?
A. A white precipitate formed.
B. The solution turned white.
C. The solution turned yellow.
D. A yellow precipitate formed.
8. What happened to the silver chloride precipitate when heated to 100oC in water?
A. It dissolved.
B. It turned yellow.
C. Nothing happened.
D. It turned white.
9. What happened to the silver chloride precipitate when you added ammonia?
A. Nothing happened.
B. It turned white.
C. It turned yellow.
D. It dissolved.
10. What happened to the silver chloride after adding ammonia and HNO3?
A. Nothing happened.
B. A yellow precipitate formed.
C. The solution bubbled.
D. A white precipitate reformed.
11. What 2 characteristics are unique to lead?
A. Lead chloride dissolves in ammonia and it forms a yellow precipitate when potassium chromate is added.
B. Lead chloride dissolves in hot water and it forms a white precipitate when potassium chromate is added.
C. Lead chloride dissolves in hot water and it forms a yellow precipitate when potassium chromate is added.
D. Lead chloride dissolves in ammonia and it forms a white precipitate when potassium chromate is added.
12. What characteristic are different between silver and mercury?
A. Mercury chloride dissolves in nitric acid while silver chloride does not.
B. Silver chloride dissolves in ammonia while mercury chloride does not.
C. Silver chloride dissolves in nitric acid while mercury chloride does not.
D. Mercury chloride dissolves in ammonia while silver chloride does not.
13. What happened when you added HCl to unknown I?
A. A yellow precipitate formed.
B. The solution turned yellow.
C. A white precipitate formed.
D. The solution turned white.
14. What happened to the unknown I precipitate when heated to 100oC in water?
A. It dissolved.
B. It turned yellow.
C. Nothing happened.
D. It turned white.
15. What happened to unknown I when you added potassium chromate?
A. Nothing happened.
B. It turned yellow.
C. It turned white.
D. It dissolved.
16. What happened to the unknown I precipitate when you added ammonia?
A. It turned white.
B. It dissolved.
C. It turned black.
D. It turned yellow.
17. What happened when you added HCl to unknown II?
A. The solution turned white.
B. The solution turned yellow.
C. A yellow precipitate formed.
D. A white precipitate formed.
18. What happened to the unknown II precipitate when heated to 100oC in water?
A. It turned green.
B. It turned white.
C. It turned yellow.
D. Nothing happened.
19. What happened to unknown II when you added potassium chromate?
A. It dissolved.
B. Additional white precipitate formed.
C. A yellow precipitate formed.
D. It turned white.
20. What happened to the unknown II precipitate when you added ammonia?
A. The white precipitate dissolved.
B. It turned white.
C. It turned yellow.
D. Nothing happened.
21. What happened to unknown II when you added HNO3?
A. Nothing happened
B. The white precipitate reformed.
C. It turned white.
D. It turned yellow.
22. Based on your analysis, what is the identity of unknown I?
A. Lead and silver.
B. Lead
C. Silver
D. Mercury
23. Based on your analysis, what are the identities of the substances in unknown II?
A. Lead and mercury.
B. Lead and sodium.
C. Silver and mercury.
D. Silver and lead.
24. Which of the following questions could be answered with qualitative analysis?
A. What is the molecular weight of an ion in a solution.
B. What are the identities of ions in a solution?
C. What is the concentration of ion in solution?
D. How much product was produced in a reaction?
25. Which of the following could limit the usefulness of the qualitative analysis used here?
A. There is more than one ion present in solution.
B. Contamination of the hydrochloric acid with trace amounts of water.
C. One of the ions is present in trace amounts.
D. The identity of the counter ion.