Using a single reagent and only reaction chemistry that was part of this experim

Question

Using a single reagent and only reaction chemistry that was part of this experiment, how could you distinguish between the following pairs of substances contained in seperarate test tubes? Explain in words how you could tell, and give the net-ionic equation for an reaction that occurs in the test. a. Hg2(NO3)2 and Mg(NO3)2 solutions Reagent:_____________ b. Hg2Cl2 and AgCl solids Reagent:____________ c. Na2CrO4 and HCl solutions Reagent:______________ NOTE: We were testing if Ag+,Pb2+, and Hg22+ were present. We added 2 drops 6 M HCl to our unknown centrifuged and decant to get S1 and P1. Then added 10 drops of DI water to P1 and boiled in a water bath and centrifuged and decant which now gave us S2 and P2. To solutions S1 and S2 seperately we added 2 drops 1 M K2CrO4 where formation of yellow ppt of PbCrO4 in either confirmed lead. Then to P2 we added 4 drops 15 M NH3 centrifuged and decant to get S3. If black ppt formed on the addition of NH3 confirmed mercury. To solution S3 we added 6 M HNO3 until acidic to litmus paper and the formation of a white ppt of AgCl confirmed silver.

Explanation / Answer

a) Treating with NH3 we can distinguish the pair.

b)Treating with water. The AgCl dissolves in water.

C)Treating with Pb2+.

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