Question

Collect information about extraction of metals oflow reactivity silver platinum and gold.Prepare a report.

Answer 1

low reactive metals like silver , platinum , gold etc .extracted by cyanide process.

silver found in nature argentite(Ag2S)

ores .argentite ores reacted by sodium cyanide which gives silver cyanide and sodium sulphide . again silver cyanide reacted with sodium cyanide which give complex Na [Ag (CN) 2] ,now this complex reacted with Zn which gives silver metal .the following process according to below

Ag2S+2NaCN---->2 AgCN+Na2S

AgCN+NaCN---> Na[Ag (CN) 2]

Na[Ag (CN) 2]+Zn--> Na2 [Zn (CN) 4]+2Ag

in the same way platinum and gold extracted by ores .

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