Pre-Laboratory Assignment 1. Or the following anions, Br. co ons that meet the f

Question

Pre-Laboratory Assignment 1. Or the following anions, Br. co ons that meet the following criteria and So2, list thos Gives a precipitate with Agt ion that is insol- r 2. What types of reactions are involved when ackd is added to a solution containing So, on, resulting in NO NO2. PO 4 the release of gaseous sop? (1) uble in HNOs In analyzing an unknown salt containing one of the anions discussed in this module, a student ob- tains negative resuits for all three classification reac- 3. (2) Is involved in an axidation-reduction reac tion as part of a confirmation reaction. tions. Briefly explain (3) Gives a precipitate with Ba2 ion that is solu ble in HNO3 4. A solution is known to contain at least one of the anions discussed in this module. (1) The yellowish precipitate that forms when AgNO3 solution is added to the solution dissolves when HNOs is added. Which anion(s) may be present? (4) Evolves a gas when acid is added (5) Releases an odorous gas as a product (2) A BaCl2 solution is added to this solution. A white precipitate forms that dissolves when HNO3 is added. No color, odor, or evolved gas is observed. (6) Does not produce a precipitate in any classi- ation or confirmatory reaction described in this Which anion is present? Describe a confirmatory re- action for this anion. periment

Explanation / Answer

Q:-1

(1)Gives a precipitate with Ag+ ion that is insoluble in HNO3.  Br-, Cl-, I-

(2) Is involved in an oxidation-reduction reaction as part of a confirmation reaction.  Br-, Cl-, I-, NO3-

(3) Gives a precipitate with Ba2+ ion that is soluble in HNO3.  CO32-, PO43-

(4) Evolves a gas when acid is needed.  CO32-, NO3-, NO2-, SO32-

(5) Releases an odorous gas as a product.  NO3-, NO2-,SO32-

(6) Does not produce a precipitate in any classification or confirmatory reaction described in this experiment.  SO42-

Q:-2.-Redox reactions, the sulphite is reduced (loses oxygen) to form SO2, the acid is oxidised (loses hydrogen). to form water as a product.

Q-3-It means that anions, Br–, CO3 2–, Cl–, I–, NO3 –, NO2 –, PO4 3–, , and SO3 2– are all absent except SO4 which gives negative test .

Q-4-

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