Qualitative Analysis
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Experiment 5 - Qualitative Analysis


Part C - Test for Mercury (I) Ions

  1. To about 1 mL of 0.5 M mercury (I) nitrate, Hg2(NO3)2, solution add about 1 mL of dilute HCl and mix. Record your observations.
  2. Centrifuge and separate the precipitate from the solution. Discard the solution.
  3. Add about 2 mL of distilled water and stir to wash the precipitate. Centrifuge and discard the solution.

  4. Add about 1 mL of concentrated ammonium hydroxide, NH4OH, (located in the fume hood) to the precipitate.

    The formation of a black or grey precipitate confirms the presence of mercury (I) ions. The precipitate is a mixture of elemental mercury, Hg, and the white compound called mercury (II) amido chloride, HgNH2Cl. Record your observations.


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