2. Solid nickel carbonate (NiCOs) is pretty insoluble in water, as are many meta

Question

2. Solid nickel carbonate (NiCOs) is pretty insoluble in water, as are many metal carbonates. But it is much more soluble i n aqueous solutions of 0.1 M NHs. Nickel (II) reacts with ammonia to form a hexa-amino complex ion (hex means 6). Nickel (II) is also mildly acidic, ut you can ignore that part of the system if you want, as well as any ion pairs that may form (your choice). A.) Write the balanced chemical equations that explain the solubility behavior of this compound. Is the greater solubility in ammonia due to NHs being a base or being a ligand? Explain. B) write the charge balance expression that applies to the BCE's you wrote above. Write one mass balance expression that relates the concentration of nickel ion to other concentrations in the system.

Explanation / Answer

(A) NiCO3 + 6NH3 ---> [Ni(NH3)6]+2 CO3

Above equation is balanced chemical equation .

(B)Charge balance (solution is neutral)

[Ni(NH3)]+2 +[NH3] +[NiCO3]= CO3-2

(C)Mass balance (sum of all masses of all forms of acids is equal to initial concentration)

[NH3] =0.1

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