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Potassium sulfide
Potassium sulfide
IUPAC name
Other names Dipotassium monosulfide,
Dipotassium sulfide,
Potassium monosulfide
Identifiers
CAS number 1312-73-8
RTECS number TT6000000
Properties
Molecular formula K2S
Molar mass 110.262 g/mol
Appearance pure: colourless
impure: yellow-brown
Density 1.8 g/cm3
Melting point

840 °C

Boiling point

decomposes

Solubility in water converts to KSH, KOH
Solubility in other solvents soluble in ethanol and glycerol
Structure
Crystal structure antiFluorite
Hazards
R-phrases 31-34
S-phrases 26-45
Related compounds
Related compounds Na2S
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Potassium sulfide is the chemical compound with the formula K2S. It is an inorganic polymer with the "antifluorite structure," which means that the small K+ ions occupy the tetrahedral (F) sites in fluorite, and the larger S2− centers occupy the eight-coordinate (Ca2+) sites. Li2S, Na2S, and Rb2S crystallize similarly.[1]

This salt contains the highly basic anion S2−, which completely hydrolyzes in water according to the following equation:

K2S + H2O → KOH + KSH

For many purposes, this reaction is inconsequential since the mixture of SH and OH behaves as a source of S2−. Other alkali metal sulfides behave similarly.[1]

K2S arises from the reaction of potassium and sulfur. In the laboratory, this synthesis is usually conducted in a solution of anhydrous ammonia.

Use in fireworks

Potassium sulfides are formed when black powder is burned, and are important intermediates in many pyrotechnic effects, such as senko hanabi and some glitter formulations. The compound is not added directly to the fireworks but rather forms during their combustion.[2]

See also

Liver of sulfur

References

  1. ^ a b Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.
  2. ^ Shimizu, Takeo. "Fireworks: the Art, Science, and Technique." Pyrotechnica Publications: Austin, 1981. ISBN 0-929388-05-4.
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Simple English

Potassium sulfide is a chemical compound. Its chemical formula is K2S. It contains potassium and sulfide ions. The potassium is in its +1 oxidation state.

Properties

Potassium sulfide is a colorless solid when it is pure. Sometimes it is not pure and it is yellow-brown. It reacts with water to make KHS, potassium hydrogen sulfide, and potassium hydroxide. It reacts with acids to make hydrogen sulfide and a potassium salt.

Preparation

Potassium sulfide is made by reacting potassium with sulfur. Many times the potassium is dissolved in liquid ammonia. It can also be made by reacting potassium sulfate with carbon. It is made when black powder is burned.

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