Calcium sulfide is the chemical compound with the components CaS. This white materials crystallizes in cubes like rock salt. CaS has been studied as a part in a course of that might recycle gypsum, a product of flue-gas desulfurization. Like many salts containing sulfide ions, CaS usually has an odour of H2S, which ends from small quantity of this fuel shaped by hydrolysis of the salt.
When it comes to its atomic construction, CaS crystallizes in the identical motif as sodium chloride indicating that the bonding on this materials is extremely ionic. The excessive melting level can be in line with its description as an ionic stable. Within the crystal, every S2− ion is surrounded by an octahedron of six Ca2+ ions, and complementarily, every Ca2+ ion surrounded by six S2− ions.
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Manufacturing[edit]
CaS is produced by “carbothermic reduction” of calcium sulfate, which entails the conversion of carbon, often as charcoal, to carbon dioxide:
and may react additional:
Within the second response the sulfate (+6 oxidation state) oxidizes the sulfide (-2 oxidation state) to sulfur dioxide (+4 oxidation state), whereas it’s being diminished to sulfur dioxide itself (+4 oxidation state).
CaS can be a byproduct within the Leblanc course of, a as soon as main industrial course of for producing sodium carbonate. In that course of sodium sulfide reacts with calcium carbonate:[1]
Hundreds of thousands of tons of this calcium sulfide byproduct was discarded, inflicting in depth air pollution and controversy.[2]
Milk of lime, Ca(OH)2, reacts with elemental sulfur to provide a “lime-sulfur”, which has been used as an insecticide. The lively ingredient might be a calcium polysulfide, not CaS.[3]
Reactivity and makes use of[edit]
Calcium sulfide decomposes upon contact with water, together with moist air, giving a combination of Ca(SH)2, Ca(OH)2, and Ca(SH)(OH).
It reacts with acids akin to hydrochloric acid to launch poisonous hydrogen sulfide fuel.
Calcium sulfide is phosphorescent, and can glow a blood purple for as much as an hour after a lightweight supply is eliminated.[4]
Pure prevalence[edit]
Oldhamite is the title for mineralogical type of CaS. It’s a uncommon part of some meteorites and has scientific significance in photo voltaic nebula analysis.[5][6] Burning of coal dumps also can produce the compound.[7]
See additionally[edit] – “calcium sulfide chemical formula”
References[edit]
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