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 seperate test tubes.

Please solve question 3 only!! Supporting information will be posted underneath the first picture.

GRO UPICATIONS: THE SILVER Name 3. ment. how could you distinguish berween the following pairs of substances contained in separate test tubes? Esplain in words how you coald tell, and give the ner-ionic equation for any reaction that occurs in the test. a. Pb(NO,), and Ca(NO,), solutionsRea Reagent: b. PbCI, and AgCl solids Reagent c. HNO, and HCl solutions 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 HCI is added to the unknown. After discarding the supernate (S1), hot water is added to the precipitate (P1) and the mixture boiled for 5 minutes. After removing the mix- ture from the hot water bath, it is left at room temperature for 10 minutes before

Explanation / Answer

Reagent KI can be used (for Pb(NO3)2 and Ca(NO3)2

Pb2+ + 2KI give PbI2 (s) + 2K+ (golben yellow ppt)

PbCl2 is soluble in water where as AgCl is insoluble

Pb2+ + Cr2O72- give PbCr2O7 (s) (yellow in color) reagent pottassium dichromate

HNO3 and HCl

Add AgNO3 solution

the HCl will give a white precipitate

reaction is

Ag+ + Cl- give AgCl(s)

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