3. The qualitative analysis scheme in this exercise involved adding reagents to

Question

3. The qualitative analysis scheme in this exercise involved adding reagents to confirm the presence of cations, specifically, Ba2+, Pb2+, and Fe3+. Could this or a similar procedure be used for the qualitative analysis of anions? Review your observations and suggest a procedure that could be used to confirm the presence of the following anions. For each case, write the net ionic equation for the reaction involved. a. Chloride (CI-): b. Sulfate (SO) EXPERIMENT 13: QUALITATIVE ANALYSIS OF A GROUP OF CATIONS

Explanation / Answer

3.

Qualitative analysis of anions can be achieved similar to the qualitative analysis of cations

a. Chloride (Cl-)

add AgNO3, forms AgCl as white precipitate

net-ionic equations,

Ag+ + Cl- --> AgCl

No precipitate with BaCl2 solution.

b. sulfate (SO4^2-)

add BaCl2 solution, forms white precipitate of BaSO4

net-ionic equation,

Ba2+ + SO4^2- --> BaSO4

Forms white precipitate with AgNO3

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So by adding BaCl2 solution, only SO4^2- forms precipitate and not Cl-. Thu we can distinguish between the two anions.

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