Defineamalgamation. Discussitsusein thepurificationof goldand silver.C – InterviewSolution

1.	Defineamalgamation. Discussitsusein thepurificationof goldand silver.CanFebe purifiedbythis method ?
Answer» Solution :A homogeneousmixtureofa metaloranon- metalwithmercuryis calledamalgam. Sincetheatomicradii OFAG(144 pm) and Au (144 pm ) arequiteclosetoHg (157 pm ) butwidelydifferentfromFe (126 pm ),therefore,AG andAuformamalgamsbutFedoesnot. Whenimpuresilverorgoldistreatedwithmercury,itformsamalgamleavingbehindimpurities. ` 2 Ag +X Hgtounderset ("Silver amalgam ")(Ag_2 Hg _ x ) ,2Au +x Hg tounderset ("Gold amalgam") (Au_2 Hg_x ) ` Theseamalgams areseparatedfromtheimpuritiesanddistilled,mercurydistilsover leavingbehind puresilverorgold.

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