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Question

Given that 1 moles of NiCl2.6H2O with excess AgNO3 precipitate 2 moles of AgCl, what is the coordination number of Ni?

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Solution

NiCl2.6H2O on reacting with excess AgNO3, it gives 2 moles of AgCl. This indicates that the 2Cl ions in the complex is not bounded by the coordination sphere and hence are present as counter ions of the complex.
Thus, the coordination complex is [Ni(H2O)6]2+ 2Cl.
Thus, 6 water molecules are bounded to the Ni and hence, the coordination number is 6.

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