Subjective Type

Name the chief ore of silver. Describe with chemical equations the extraction of silver from this ore.

Solution

The chief ore of silver is argentite or silver glance $$(Ag_{ \ 2}S)$$.

The extraction of silver from argentite: Argentite ore is treated with dilute solution of $$NaCN$$ in presence of oxygen to oxidise sodium sulphide to sodium sulphate to form a soluble complex.

$$Ag_{2}S + 4NaCN\ 2Na [Ag \rightarrow (CN)_{2}] + Na_{2}S$$

$$Zn$$ acts as reducing agent and displaces silver from the complex.

$$2Na[Ag(CN)_{2}] + Zn \rightarrow Na_{2}[Zn(CN)_{4}] + 2Ag\downarrow$$

The crude $$Ag$$ metal thus obtained is refined by fusion with borax or by electrolysis.

SIMILAR QUESTIONS

Metallurgy

The decomposition of silver chloride is catalysed by:

Metallurgy

The anode mud in the electrolyte refining of silver contains :

Metallurgy

When 1 mol of pure $$Ag_2CO_3$$ is strongly heated, calculate the weight of residue obtained in gm.

Metallurgy

Extraction of silver from commercial lead is possible by

Metallurgy

From argentite $$( Ag_2S) $$ ore the method used in obtaining metallic silver is

Metallurgy

An ore contains 1.34% of the mineral argentite, Ag2S by mass. How many gram of this ore would have to be processed in order to obtain 1.00g of pure solid silver, Ag?

Metallurgy

Identify the substance underlined, in each of the following cases: The electrolyte used for electroplating an article with silver.

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