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Potassium hydrosulfide

Potassium hydrosulfide is an inorganic compound with the formula KSH. This colourless salt consists of the cation K+ and the bisulfide anion [SH]−. It is the product of the half-neutralization of hydrogen sulfide with potassium hydroxide. The compound is used in the synthesis of some organosulfur compounds.[1] Aqueous solutions of potassium sulfide consist of a mixture of potassium hydrosulfide and potassium hydroxide.

Potassium hydrosulfide
Names
IUPAC name
Potassium hydrosulfide
Other names
Potassium bisulfide, Potassium sulfhydrate, potassium hydrogen sulfide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard100.013.803 Edit this at Wikidata
EC Number
  • 215-182-9
UNII
  • InChI=1S/K.H2S/h;1H2/q+1;/p-1 ☒N
    Key: ZOCLAPYLSUCOGI-UHFFFAOYSA-M ☒N
  • InChI=1/K.H2S/h;1H2/q+1;/p-1
    Key: ZOCLAPYLSUCOGI-REWHXWOFAJ
  • [SH-].[K+]
Properties
KSH
Molar mass72.171 g/mol
Appearancewhite solid
Density1.68–1.70 g/cm3
Melting point455 °C (851 °F; 728 K)
good
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
Flammable solid, stench, releases hydrogen sulfide
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasFlammability 2: Must be moderately heated or exposed to relatively high ambient temperature before ignition can occur. Flash point between 38 and 93 °C (100 and 200 °F). E.g. diesel fuelInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
3
2
0
Related compounds
Other anions
Potassium hydroxide
Other cations
Sodium hydrosulfide
Related compounds
potassium sulfide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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The structure of the potassium hydrosulfide resembles that of potassium chloride. Their structure is however complicated by the non-spherical symmetry of the SH− anions, but these tumble rapidly in the solid.[2]

The addition of sulfur gives dipotassium pentasulfide.

Synthesis

It is prepared by neutralizing aqueous KOH with H2S.[3][4]

References

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