Question

Write the equation for the extraction of silver by leaching with sodium cyanide and
show that the leaching process is a redox reaction.

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Answer 1

Answer:

The solution of sodium argento cyanide combines with zinc dust and forms sodium tetra cyano zincate and precipitated silver. Step 2: Zn + 2Na[Ag(CN)2] → Na [Ag(CN)2] + 2 Ag↓ In the step 2, redox reaction take place.

Answer 2

Answer:

The crushed ore of argentite (Ag2S) is leached with sodium cyanide solution. This reaction forms sodium argento cyanide Na[Ag(CN)2] Step 1: Ag2S + 4NaCN ⇌ 2Na[Ag(CN)2] + Na2S The solution of sodium argento cyanide combines with zinc dust and forms sodium tetra cyano zincate and precipitated silver.