Once it has been dissolved from the other two cations, it is centrifuged and the liquid is decanted into another test tube. Once in the other test tube, a drop of 6.0 M acetic acid and two drops of 1.0 M K2CrO4 is added to the saved liquid. If the lead (II) cation is present, a yellow precipitate forms and ensures the presence of that cation. When testing my unknown solution, the lead (II) ion was not present in my solution. To further separate the cations, 1.0 mL of 6 M NH3 is added to the saved precipitate. After adding the ammonia, the mixture is centrifuged and the liquid is once again decanted into another test tube. If a gray or black precipitate forms, this proves the presence of Hg22+. The mercury (I) ion was present in my
Once it has been dissolved from the other two cations, it is centrifuged and the liquid is decanted into another test tube. Once in the other test tube, a drop of 6.0 M acetic acid and two drops of 1.0 M K2CrO4 is added to the saved liquid. If the lead (II) cation is present, a yellow precipitate forms and ensures the presence of that cation. When testing my unknown solution, the lead (II) ion was not present in my solution. To further separate the cations, 1.0 mL of 6 M NH3 is added to the saved precipitate. After adding the ammonia, the mixture is centrifuged and the liquid is once again decanted into another test tube. If a gray or black precipitate forms, this proves the presence of Hg22+. The mercury (I) ion was present in my