Sodium hydrosulfide


Sodium hydrosulfide
Sodium hydrosulfide
Identifiers
CAS number 16721-80-5 YesY
207683-19-0 (hydrate)
PubChem 28015
ChemSpider 26058 YesY
UNII FWU2KQ177W YesY
EC number 240-778-0
RTECS number WE1900000
Jmol-3D images Image 1
Properties
Molecular formula NaHS
Molar mass 56.063 g/mol
Appearance off-white solid, deliquescent
Density 1.79 g/cm3
Melting point

52–54 ºC (hydrate)
350 ºC (anhydrous)

Hazards
MSDS TDC MSDS
EU Index Toxic
R-phrases R17 R23 R24 R25
Main hazards Flammable solid, stench, releases hydrogen sulfide
NFPA 704
NFPA 704.svg
2
3
0
Flash point 90 ºC
Related compounds
Other anions Sodium hydroxide
Sodium amide
Other cations Ammonium hydrosulfide
Related compounds Sodium sulfide
 YesY hydrosulfide (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Sodium hydrosulfide is the chemical compound with the formula NaHS. This compound is the product of the half neutralization of hydrogen sulfide with sodium hydroxide. NaHS is a useful reagent for the synthesis of organic and inorganic sulfur compounds. It is a colorless solid that typically smells like H2S due to hydrolysis by atmospheric moisture. In contrast with sodium sulfide, Na2S, which is insoluble in organic solvents, NaHS, being a 1:1 electrolyte, is more soluble. Alternatively, in place of NaHS, H2S can be treated with an organic amine to generate an ammonium salt. Solutions of HS are sensitive to oxygen, converting mainly to polysulfides, indicated by the appearance of yellow.

Contents

Structure and properties

Crystalline NaHS undergoes two phase transitions. At temperatures above 360 K, NaHS adopts the NaCl structure, which implies that the HS behaves as a spherical anion due to its rapid rotation leading to equal occupancy of eight equivalent positions. Below 360 K, a rhombohedral structure forms, and the HS sweeps out a discoidal shape. Below 114 K, the structure becomes monoclinic. The analogous rubidium and potassium compounds behave similarly.[1]

NaHS has a relatively low melting point of 350 °C. In addition to the aforementioned anhydrous forms, it can be obtained as two different hydrates, NaHS·2H2O and NaHS·3H2O. These three species are all colorless and behave similarly, but not identically.

Preparation

The usual laboratory synthesis entails treatment of sodium methoxide, NaOMe, with hydrogen sulfide:[2]

NaOMe + H2S → NaHS + MeOH

Industrially, NaOH is employed as the base. The quality of the NaHS can be assayed by iodometric titration, exploiting the ability of HS to reduce I2.

Applications

Thousands of tons of NaHS are produced annually. Its main uses are in paper manufacture as a makeup chemical for sulfur used in the Kraft process, as a flotation agent in copper mining where it is used to activate oxide mineral species, and in the leather industry for the removal of hair from hides.

References

  1. ^ Haarmann, F.; Jacobs, H.; Roessler, E.; Senker, J. (2002). "Dynamics of anions and cations in hydrogensulfides of alkali metals (NaHS, KHS, RbHS): A proton nuclear magnetic resonance study". J. Chem. Phys. 117: 1269–1276. doi:10.1063/1.1483860. 
  2. ^ Eibeck, R. I.; Zingaro, Ralph A.; McGlothlin, Raymond E. (1963). "Sodium Hydrogen Sulfide". Inorg. Synth. 7: 128–31. doi:10.1002/9780470132388.ch35 

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Look at other dictionaries:

  • sodium hydrosulfide — natrio hidrosulfidas statusas T sritis chemija formulė NaHS atitikmenys: angl. sodium hydrogen sulfide; sodium hydrosulfide rus. натрий кислый сернистый; натрия бисульфид; натрия гидросульфид ryšiai: sinonimas – natrio vandenilio sulfidas …   Chemijos terminų aiškinamasis žodynas

  • sodium hydrosulfide — noun : a hygroscopic crystalline compound NaSH used chiefly in dehairing hides; sodium hydrogen sulfide …   Useful english dictionary

  • Sodium hydroxide — Sodium hydroxide …   Wikipedia

  • Sodium sulfide — Other names Disodium sulfide Identifiers …   Wikipedia

  • sodium sulfide — noun : a sulfide of sodium; especially : a crystalline compound Na2S usually obtained by heating sodium sulfate with coal or hydrogen and used in dehairing hides, in the manufacture of sulfur dyes, as a solvent for these dyes, and as a reducing… …   Useful english dictionary

  • sodium hydrogen sulfide — natrio hidrosulfidas statusas T sritis chemija formulė NaHS atitikmenys: angl. sodium hydrogen sulfide; sodium hydrosulfide rus. натрий кислый сернистый; натрия бисульфид; натрия гидросульфид ryšiai: sinonimas – natrio vandenilio sulfidas …   Chemijos terminų aiškinamasis žodynas

  • sodium sulfydrate — noun : sodium hydrosulfide not used systematically …   Useful english dictionary

  • Ammonium hydrosulfide — IUPAC name …   Wikipedia

  • Bisulfide — The Bisulfide ion, also called hydrosulfide, is the anion with the formula [HS] − (commonly written [SH] −). This species is the conjugate base of hydrogen sulfide::H2S unicode|⇌ HS− + H+In aqueous solutions, at pH greater than 7, hydrogen… …   Wikipedia

  • Hydrogen sulfide — Systematic name …   Wikipedia


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