How can you use spectrophotometry to confirm that this reaction on [Cu(NH3)4] 2+ has occurred

 [Cu(NH3)4] 2+ solutions exhibit a deep blue-violet color. How can you use spectrophotometry to confirm that this reaction has occurred and that the product formed is in fact tetraamminecopper(lI)sulfate. Would you expect the wavelength of maximum absorbance (λmax) for Cu(NH3)4 2+ to be greater than or less than λ max for Cu(H2O)6 2+? Explain.

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