Question

An unknown solution may contain any of these nine ions: CO32–, SO42–, CrO42–, Cl–, SCN–, Pb2+,...

An unknown solution may contain any of these nine ions: CO32–, SO42–, CrO42–, Cl, SCN, Pb2+, Ni2+, Cu2+, or Fe3+.   Using the chemistry you learned in this experiment and a table of solubility rules, list all pairs of ions that could not possibly be present together in the unknown.

Homework Answers

Answer #1

Solubility of metal salts in water largely depends on the anions

Carbonates: most of them are insoluble. except Na+,K+ and NH4+ carbonates

Sulfates: Most of them are soluble, except Ba2+and Pb2+

Chromates: Frequently insoluble

Chlorides: Mostly soluble, exceptions: Ag+, Pb2+,Hg2+

Thiocyanate: Mostly soluble, exceptions:Fe3+

Basing on these general trends, following pairs are not possible to existsin aquesous solution as they precipitate out of the solutions

Pb2+: CO32–, SO42–, CrO42–, Cl, .  

Ni2+: CO32–, CrO42–

Cu2+: CO32–, CrO42–, SCN

Fe3+: CO32–, CrO42–,

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