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Overview
Silver(I) sulfide (SILL-ver one SUL-fide) is a grayish-black heavy powder. Most people are familiar with the compound as tarnish, the black coating that covers silver tableware and jewelry when they are exposed to the air.
How It Is Made
Silver(I) sulfide occurs naturally as the minerals acanthite and argentitde, from which they can be extracted by grinding, crushing, and washing the mineral ore. The compound can also be prepared synthetically by passing hydrogen sulfide (H2S) gas through an aqueous solution of silver nitrate.
H2S + 2AgNO3 → Ag2S + 2HNO3
Key Facts
Other Names:
Argentous sulfide
Formula:
Ag2S
Elements:
Silver, sulfur
Compound Type:
Binary salt (inorganic)
State:
Solid
Molecular Weight:
247.80 g/mol
Melting Point:
925°C (1520°F)
Boiling Point:
Not applicable; decomposes
Solubility:
Insoluble in water; soluble in nitric acid, sodium cyanide (NaCN), and potassium cyanide (KCN)
The silver(I) sulfide...
This section contains 579 words (approx. 2 pages at 300 words per page) |
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