Identifying Hg2+2: 1) I took the white ppt formed formed from the first test and added 10 drops of 6M NH3. 2) I stirred the contents and then centrifuged the test tube 3) Whitish ppt stayed and did not dissolve, which is a positive confirmation for Hg2+2, therefore it contains Hg2+2.
Identifying Ag+: 1) decanted the soln from Hg2+2 into another test tube and added 6M HNO3 until it became acidic by litmus paper test 2) no white ppt formed but soln was acidic, which is a negative confirmation because no white ppt was formed, therefore no Ag+ was contained
The observations I made with the Pb+2 was the yellow ppt formed when K2CrO4 was added after the separation. Also with the Hg2+2 was that the ppt did not dissolve completely or at all, meaning that there was Hg2+2 present in the unknown. Lastly, there was no white ppt formed when testing for the separation of Ag+ because there was no Ag+ in the unknown.