BrThe chemistry and qualitative Analysis of anions. Please answer each question

Question

BrThe chemistry and qualitative Analysis of anions. Please answer each question correctly and clearly (( no hand writing)) first answer will get thumps up.. Thank you..

this is what have discussed:

Br-, CO32-, CI-, I-, NO3-,NO2-, PO43-, SO42-, SO32-

3. In analyzing an unknown salt containing one of the anions discussed in this module, a student obtains negative results for all three classification reactions. Briefly explain. 4. A solution is known to contain at least one of the anions discussed in this module. (1) The yellowish precipitate that forms when AgNO, solution is added to the solution dissolves when HNO3 is added. Which anion(s) may be present? A BaCl2 solution is added to this solution. A white precipitate forms that dissolves when HNOs is added. No color, odor, or evolved gas is observed. Which anion is present? Describea confirmatory reaction for this anion. (2) 5. In some of the classification reactions, it is important when there is no reaction upon addition of a second reagent. For which anions is this true?

Explanation / Answer

3.If th student observed negative test for all three classes of anions, the anion present must be other than the usual ones listed above. We must test for possible presence of other ions in solution. It is also possible that the anion is not present free in solution to react with the reagent added.

4.

(1) The yellow precipitate formed could be due to AgI or Ag3PO4. The precipitate dissolves upon addition of HNO3. The anion present would be PO4^3-.

(2) BaCl2 addition formed white precipitate which dissolved upon adddition of HNO3. The anion present would be SO4^2-.

Adding Pb(NO3)2 gives white precipitate,

Pb(NO3)2 + SO4^2- ---> PbSO4(s) + 2NO3-

5. CO3^2- are often the anion which interfers with the analysis of other anions such as halides. It is important that this is not present when testing for halides.

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