Chemistry help: Complex ions?

Posted on 2015-11-30 06:26:00 in Chemistry by HAMAD

Crystals of hydrated chromium(III) chloride are green, have an empirical formula of CrCl3?6H2O, and are highly soluble.

1.) Write the complex ion that exists in this compound.
2.) If the complex is treated with excess AgNO3(aq), how many moles of AgCl will precipitate per mole of CrCl3?6H2O dissolved in solution?
3.) Crystals of anhydrous chromium(III) chloride are violet and insoluble in aqueous solution. The coordination geometry of chromium in these crystals is octahedral as is almost always the case for Cr3+. How can this be the case if the ratio of Cr to Cl is not 1:6?
a)Some of the Cr3+ ions must be coordinated to other Cr3+ ions.
b) Some or all of the Cl? ions must be shared by more than one Cr3+ ion.
c) Some or all of the Cr3+ ions must be shared by more than one Cl? ion.
d) Some of the Cl? ions must be coordinated to other Cl? ions.

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