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Cyanide or Macarthur Forrest Process

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Question

Give both chemical equations of leaching of silver in silver metallurgy by using sodium cyanide?

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Solution

Chemical equations of leaching of silver in silver metallurgy by using sodium cyanide:
$A g (s) + 4 N a C N ⇋ 2 N a [A g (C N)_{2}] + N a_{2} S$
$Z n + 2 N a [A g (C N)_{2}] \to N a_{2} [Z n (C N)_{4}] + 2 A g$

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