Sodium Bisulfide
Title: Sodium Bisulfide
CAS Registry Number: 16721-80-5
Additional Names: Sodium sulfhydrate; sodium hydrosulfide; sodium hydrogen sulfide
Molecular Formula: HNaS
Molecular Weight: 56.06
Percent Composition: H 1.80%, Na 41.01%, S 57.20%
Line Formula: NaSH
Literature References: Prepd from sodium ethylate and hydrogen sulfide: Rule, J. Chem. Soc. 99, 558 (1911); Teichert, Klemm, Z. Anorg. Allg. Chem. 243, 86 (1939); Eibeck, Inorg. Synth. 7, 128 (1963). The technical grade may be obtained by reacting sodium bisulfate with calcium sulfide in the cold or by saturating NaOH solns with H2S.
Properties: Rhombohedric-cubic crystals. White to colorless. Odor of hydrogen sulfide. Very hygroscopic. Readily hydrolyzed in moist air to NaOH and Na2S. d 1.79. Turns yellow upon heating in dry air, changing to orange at higher temps. mp 350° forming a black liquid. Sol in water, alcohol, ether. Gives a blue-green soln in dimethylformamide.
Melting point: mp 350°
Density: d 1.79
 
Derivative Type: Dihydrate
Properties: Needles or flakes, mp 55°. Completely and rapidly sol in water, alcohol, ether. Note: The commercial product is usually the dihydrate. Can be shipped in lacquer-lined steel drums.
Melting point: mp 55°
 
Derivative Type: Trihydrate
Properties: Shiny rhombs, mp 22°.
Melting point: mp 22°
 
Use: Dehairing hides; desulfurizing viscose rayon; in the manuf of sulfur-contg dyes and other thio compds such as thioamides, thiourea, thioglycolic acid, thio- and dithiobenzoic acids, sodium thiosulfate.

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