Question 1 of 1 5.0 Points Match up the following questions with the most approp

Question

Question 1 of 1 5.0 Points Match up the following questions with the most appropriate answer. Each answer will be used only once.

A. K+ (aq) and Na+ (aq)

B. Group IV

C. use cobalt glass to obscure the yellow flame, look for a violet color

D. first precipitate out Group II ions

E. This ion is not oxidized

F. This ion is not reduced

G. reagents containing this ion are added in later steps

H. have no common theme

I. first precipitate out Group III ions

J. add 5M NH3 (aq), 2M NH4 Cl and 0.2M (NH4 )2 C2 O4

1. Group IV ions

2. During your Qualitative Analysis, the ions in this group will not precipitate as chlorides, sulfides or hydroxides

3. The test for ammonium ions must be done first because

4. To detect K+ (aq) in a solution that is known to contain only K+ (aq) and Na+ (aq)

5. To detect Ca2+ (aq) in a solution that is known to contain only Ca2+ (aq), Fe3+ (aq) and Al3+ (aq), you must

6. To detect Mg2+ (aq) in a solution that is known to contain only Mg2+ (aq), Cu2+ (aq) and Na+ (aq)

7. These ions form few insoluble compounds

8. According to your flow chart, how will you reduce Mg3+ (aq) to Mg 2+ (aq)?

9. During the analysis of your Qual IV unknown, how will you precipitate CaC2 O4 (s) from a solution containing Mg2+ (aq) and Ca2+ (aq) ions ?

10. According to your flow chart, how will you oxidize K+ (aq)?

Explanation / Answer

7. These ions form few insoluble compounds

E. This ion is not oxidized

1. Group IV ions H. have no common theme 2. During your Qualitative Analysis, the ions in this group will not precipitate as chlorides, sulfides or hydroxides A K+ (aq) and Na+ (aq)    3. The test for ammonium ions must be done first because G. reagents containing this ion are added in later steps 4. To detect K+ (aq) in a solution that is known to contain only K+ (aq) and Na+ (aq) C. Use cobalt glass to obscure the yellow flame, look for a violet color 5. To detect Ca2+ (aq) in a solution that is known to contain only Ca2+ (aq), Fe3+ (aq) and Al3+ (aq), you must I. first precipitate out Group III ions 6. To detect Mg2+ (aq) in a solution that is known to contain only Mg2+ (aq), Cu2+ (aq) and Na+ (aq) D. first precipitate out Group II ions

7. These ions form few insoluble compounds

B. Group IV 8. According to your flow chart, how will you reduce Mg3+ (aq) to Mg 2+ (aq)? F. This ion is not reduced 9. During the analysis of your Qual IV unknown, how will you precipitate CaC2 O4 (s) from a solution containing Mg2+ (aq) and Ca2+ (aq) ions ? j. add 5M NH3 (aq), 2M NH4 Cl and 0.2M (NH4 )2 C2 O4 10. According to your flow chart, how will you oxidize K+ (aq)?

E. This ion is not oxidized

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