1. Discuss the similarities in the tests to confirm the presence of chloride ion

Question

1.   Discuss the similarities in the tests to confirm the presence of chloride ion and silver ion (from 14A).

2.   Discuss the use of Ksp and solubilities to separate AgCl from AgBr and AgI.

3.   Use reduction-potential values to explain which halides can be oxidized by Fe3+ or by MnO4– in acidic solution.

4.   Explain why the test for I– must be done before testing for Br–.

5.   Write the half-reactions that describe the test that you conducted for NO3–.

6.   In Step 14, Ba2+ was added to the original solution, which contained all six anions. The reaction produced the precipitate BaSO4, but not BaCO3. Earlier, in Steps 11-13, BaCO3 forms as a precipitate to confirm the presence of carbonate ions. Why didn’t BaCO3 precipitate in Step 14?

Explanation / Answer

1.   Discuss the similarities in the tests to confirm the presence of chloride ion and silver ion (from 14A).

Chloride ions --> will precipitate with either halide / Lead ions and Merucry ions in acidic solution:: Cl-, Br-, I-, Pb+2, Hg2+2

2.   Discuss the use of Ksp and solubilities to separate AgCl from AgBr and AgI.

Ksp ni Agcl3 and AgBr and AgI family is only recommended when there is no other way to identifty the halides

the Ksp values are too small to be reliable for selective preciptiation

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