A commercially available hydrated chromium chloride has the composition CrC13. 6

Question

A commercially available hydrated chromium chloride has the composition CrC13. 6H20. Boiling an aqueous solution of the chromium chloride causes the solution to become violet, and the solution has as molar conductivity similar to an aqueous solution of [Co(NH,)]Cl. In contrast, CrCl,.5H2O is green and in aqueous solution exhibits a lower molar conductivity. If a slightly acidic aqueous of solution of CrC13·5H20 is allowed to stand for a few hours, however, the solution becomes violet. Based on these observations determined the formulas of the violet and green chromium complexes and determine the point groups to which they belong.

Explanation / Answer

CrCl35H2O similar to the [Cr(NH3)5Cl]Cl2 colour remain same of Cr green in aq solution due to charge on complex ion

after absord light colour change to violet colour due d-d transition

octahedral complex ions -- resulting octahedral point group

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