SECTION POSTLABORATORY ASSIGNMENT 1. An \"iodide/chloride/sulfate\" unknown solu

Question

SECTION POSTLABORATORY ASSIGNMENT 1. An "iodide/chloride/sulfate" unknown solution gave a yellow precipitate aqueous 3. The supernate did not react with Ba(NO32. A portion of the yellow precipitate olved in aqueous NH4OH. After centrifuging, the supernate was acidified with HNO3. which gave a white precipitate. State the anion(s) confirmed present and absent in the unknown solution Anion(s) present Anion(s) absent O- 2. An "iodide/chloride/sulfate" unknown solution gave no reaction with aqueous AgN However, the unknown solution produced a white precipitate with aqueous Ba(NO3)2. State the anion(s) confirmed present and absent in the unknown solution. Anion(s) absent Anion(s) present

Explanation / Answer

1)

Halogens reacts with AgNO3 to form precipitate.

Chloride ion gives white precipitate this white precipitate soluble in NH4OH solution.

Iodide ion give yellow precipitate and this yellow precipitate insoluble in NH4OH solution.

Cl- + AgNO3 -------> AgCl

I- + AgNO3 ---------> AgI

Sulfate ion Reacta with Ba(NO3)2 to give white precipitate BaSO4.

Hence the ions present are chloride and iodide.

Ion absent is Sulfate.

2.

Here unknown not give reaction with AgNO3 so chloride and iodide are absent.

Give white precipitate with Ba(NO3)2. So sulfate ion is present.

Hence, anion present is Sulfate.

Anions absent is chloride and iodide.

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