Name 3. how could you distinguish between the following pairs of substances cont

Question

Name 3. how could you distinguish between the following pairs of substances contained in separate test tubes? Explain in words how you could tell, and give the net-ionic equation for any reaction that occurs in the test. Pb(NO), and CalNO), solutions Reagent: a. b. PbCl, and AgCl solids Reagent: HNO, and HCl solutions Reagent: c. 4. A student has an unknown solution that can contain any combination of Group I cations. A white precipitate (PI) forms when excess 6 M HCl is added to the unknown. After discarding the supernate (S1), hot water is added to the precipitate (PI) and the mixture boiled for 5 minutes. Afier removing the mix- ture from the hot water bath, it is left at room temperature for 10 minutes before centrifuging and removing the supernate (S2) from the precipitate (P2). S2 gives no precipitate when 1 M K,CrO, is added. When 15 M NH, is added to P2a black precipitate forms. Complete the following table. For each cation, put a check mark to indicate whether the description allows you to say that the cation is definitely present, definitely absent, or possibly preent or absent. Possibly Present or Absent lon Present Absent Ag 2+ Hg,

Explanation / Answer

For question 3, the statement asks to use the reagents used in your experiment, the information about the experiment has not been provided

For question 4.

HCl added to Ag, Pb and Hg will produce a white precipitate like

AgCl , PbCl2, Hg2Cl2

since no precipitate has been gotten with the addition of K2CrO4, Pb is absent

Since a black ppt has been gotten with the addition of NH3 then Hg2+2 is present

Since you didnt perform a test for Ag like adding HNO3 to get AgCl then we cannot be sure about the presence of this one.

Ag is possibly present or absent

*hope this helps =)

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