A hydrate isomer of CrBr₃·6H₂O has some bromide inside the coordination sphere and shows no geometrical isomerism. 0.1 mol of it is dissolved in 1 L and treated with excess AgNO₃. Find the mass of the

Question

A hydrate isomer of CrBr₃·6H₂O has some bromide inside the coordination sphere and shows no geometrical isomerism. 0.1 mol of it is dissolved in 1 L and treated with excess AgNO₃. Find the mass of the precipitate in g, to the nearest integer. (AgBr = 188 g mol⁻¹)

TestHub · Accepted Answer

The isomer is [Cr(H₂O)₅Br]Br₂·H₂O, with one inner Br and two ionisable Br. Only free Br⁻ precipitates: 0.1 × 2 = 0.2 mol AgBr = 0.2 × 188 = 37.6 g, which is 38 g. [Cr(H₂O)₄Br₂]Br would show cis–trans isomerism.

Chemistry - Coordination Chemistry Question with Solution | TestHub

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