In EXP 4, after adding hot water in Procedure 1b, a white precipitate remains. The identity of this white precipitate could be ________. MARK ALL THAT APPLY. AgCl Hg$_2$Cl$_2$ AgNO$_3$ PbCl$_2$ PbSO$_4$ HCl
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A solution may contain Ag+, Pb2+, and/or Hg22+. A white precipitate forms when 6 M HCl is added. The precipitate is partially soluble in hot water. The supernatant and the precipitate are places into two separate test tubes. The solid remaining after treatment with hot water turns black on addition of 6 M NH3. The supernatant is tested with K2CrO4 and a yellow precipitate is formed. No other precipitates are observed while preforming the procedure. Which of the ions are present and which are absent? State your reasoning. NOTE: simply listing ions below without the appropriate reasoning will NOT earn you any credit!!!
Kevin C.
Procedure 2: You add cold HCl and notice a white precipitate. You set the test tube in boiling water and you notice you don't have a precipitate Procedure 3: You split the decanted solution in half, into two different test tubes In the first half, you add potassium chromate into the solution. You notice a yellow precipitate In the second half, you add sulfuric acid. You notice a white precipitate Cations Present, Undetermined, or Absent: Pb: ? Hg: ? Ag: ?
Adi S.
2. A solution may contain one or more of the Group I cations. A white precipitate forms when 6 M HCl is added to the solution. The precipitate is insoluble in hot water. The precipitate is then found to be completely soluble in 6 M NH3. Indicate whether Pb2+ is present, undetermined, or absent. 3. A solution may contain one or more of the Group I cations. A white precipitate forms when 6 M HCl is added to the solution. The precipitate is insoluble in hot water. The precipitate is then found to be completely soluble in 6 M NH3. Indicate whether Hg2+ is present, undetermined, or absent. 4. A solution may contain one or more of the Group I cations. A white precipitate forms when 6 M HCl is added to the solution. The precipitate is insoluble in hot water. The precipitate is then found to be completely soluble in 6 M NH3. And reprecipitates after adding HNO3. Indicate whether Ag+ is present, undetermined, or absent.
David C.
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