6. The NH3 solution is used, in three separate instances, to separate two ions.

Question

6. The NH3 solution is used, in three separate instances, to separate two ions. In each of thesecases, one ion forms a precipitate and the other ion remains in solution as a complex.Describe each of these instances, using reaction equations.
7. Al3+ and Zn2+ ions are amphoteric. Describe how the amphoteric nature of these ions isshown in your testing.

Known Unknown Test Procedure results conclusion results conclusion 1 Add HCl to test tube #1 White ppt Ag+,Pb+,Hg2+ White ppt Ag+,Pb+,Hg2+ 2 Add H2SO4 to check for Pb+ White ppt Pb+ No white ppt No Pb+ 3 Add NH3 to check for Hg2^2+ Grey ppt Hg2^2+ Grey ppt Hg2^2+ present 4 Add 15 drops HCl check pH White ppt Ag+ No ppt No Ag+ 5 Add HNO3 and NaBiO3 Purple Mn+ No purple No Mn+ 6 Add KNO2 to check for Co2+ Yellow ppt Co2+ No yellow No Co2+ 7 Add NH3 to check for Cu2+ Blue color Cu2+ No blue No Cu2+ 8 Add KSCN for Fe+ Deep red Fe+ Red color Fe+ present 9 Add HCl, drop to H2O for Bi3+ White cloud Bi3+ No cloud No Bi3+ 10 Add HCl & NH3 for Al3+ Gelatinous Al3+ No Gelatine No Al3+ 11 Add HCl & FeCN for Zn2+ White ppt Zn2+ No ppt No Zn2+

Explanation / Answer

6. Cu2+ + 4NH3 = [Cu(NH3)4]2+

Hg2X2 + 2NH3 = Hg2(NH3)2 + X2

7. An amphoteric substance is one that can behave as a Lewis acid and a Br

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