Question

4. The starting material, NiCI) 6H O is lime green and the product, Ni(NH>Cl is dark purple. Suppose that over the course of one week, the storage vial was not capped properly and the dark purple product absorbed some water from the air, lost some NHi gas and reformed some of the starting material. This is often evident as a light green "crust" around the dark purple product after storage. How would reformation of the starting material affect the mass of the sample in the vial? Explain your answer and be specific in your reasoning

can someone explain this?

Answer 1

The formation of green colored NiCl₂. 6H₂O from the closed vial containing dark purple colored  Ni(NH₃)₆Cl₂ impacted the proportion, amount of substance in the vial.

There is decrease in the weight of dark purple colored  Ni(NH₃)₆Cl₂ , in vial which consequently decreases mole of Ni(NH₃)₆Cl₂ .

Hence, this changes brings significant changes on the proportion of constituents participate in the following reaction-

Ni(NH₃)₆Cl₂  (s) + 6 H₂O (g) -------------> NiCl₂. 6H₂O + 6 NH₃ (g)

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