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Why did the color of copper(II) sulfate changed upon adding concentrated ammonia, NH3?

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Why did the color of copper(II) sulfate changed upon adding concentrated ammonia, NH3?

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  1. it formed a new ion;

    [Cu(NH3)4]+2  & its color is a darker blue

    it absorbs a different wavelength of light that is more energetic than the wavelength absorbed by the light blue ion [Cu(H2O)4]+2 that you had initially

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