A \"silver\" ring was purchased at a local store. It was stamped \"sterling silv

Question

A "silver" ring was purchased at a local store. It was stamped "sterling silver" which means that it must contain 92.5% by mass Ag. The remaining 7.5% may technically be any other metal. Copper is typically used for this. This ring was found to be magnetic, which suggests that the non silver part may contain iron or nickel as well. A small amount of the ring is dissolved in nitric acid, making a solution of the nitrate of any metal that would be present. A. What group does each of the four metals belong to? B. After the removal of the silver as the insoluble chloride, the solution is made basic with 6M NH4OH. If the solution turns violet, with no blue color present, what cation was present in the solution? C. What would the cation present be if the solution turned a very strong navy blue color instead, when the ammonium hydroxide was added?

Explanation / Answer

Silver ring contain Ag, Cu, Ni, Fe

A) Ag+ - I group

Cu2+ - II group

Fe3+ - III group

Ni2+ - IV group

B) May be Fe3+, it on reaction withNH4OH and forms [Fe(NH3)4(H2O)2]3+ which has violet color

C) Cu2+ reacts with NH4OH to form [Cu(NH3)4]2+ which has navy blue color

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