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      • Sodium hydrosulfide is the chemical compound with the formula NaSH. This compound is the product of the half-neutralization of hydrogen sulfide (H2S) with sodium hydroxide (NaOH). NaSH and sodium sulfide are used industrially, often for similar purposes. Solid NaSH is colorless. The solid has an odor of H2S owing to hydrolysis by atmospheric moisture. In contrast with sodium sulfide (Na2S), which is insoluble in organic solvents, NaSH, being a 1:1 electrolyte, is more soluble.


      Structure and properties


      Crystalline NaHS undergoes two phase transitions. At temperatures above 360 K, NaSH adopts the NaCl structure, which implies that the HS− behaves as a spherical anion owing 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.
      NaSH has a relatively low melting point of 350 °C. In addition to the aforementioned anhydrous forms, it can be obtained as two different hydrates, NaSH·2H2O and NaSH·3H2O. These three species are all colorless and behave similarly, but not identically. It can be used to precipitate other metal hydrosulfides, by treatment of aqueous solutions of their salts with sodium hydrosulfide. It is analogous to sodium hydroxide, and is a strong base.


      Preparation


      One laboratory synthesis entails treatment of sodium ethoxide (NaOEt) with hydrogen sulfide:

      NaOCH2CH3 + H2S → NaSH + CH3CH2OH
      An alternative method involves reaction of sodium with hydrogen sulfide.


      Applications


      Thousands of tons of NaSH are produced annually. Its main uses are in cloth and 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

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    Sodium hydrosulfide - Wikipedia

    Sodium hydrosulfide is the chemical compound with the formula NaSH. This compound is the product of the half-neutralization of hydrogen sulfide (H2S) with sodium hydroxide (NaOH). NaSH and sodium sulfide are used industrially, often for similar purposes. Solid NaSH is colorless.

    Sodium hydrosulfide | NaHS | CID 28015 - PubChem

    Sodium hydrosulfide is a colorless to light yellow crystalline solid or fused mass. It is corrosive to skin and metal. Used in paper pulping, manufacturing dyes, and dehairing hides. Sodium hydrosulfide, solution appears as a colorless to light-yellow liquid. Corrosive to metals and tissue.

    Sodium Hydrosulfide - an overview | ScienceDirect Topics

    Sodium hydrosulfide (sometimes called NaSH or sodium bisulfide) was one of the active reagents that is stable as long as the solution pH is high. Operators conducted the chemical reaction in an aqueous solution at about 32°F (0°C) to minimize side reactions and maintain product quality.

    Sodium hydrosulfide - chemeurope.com

    Sodium hydrosulfide is the chemical compound with the formula NaSH. Other names include sodium bisulfide, sodium sulfhydrate, sodium hydrogen sulfide and Nash. This species is the product of the half -neutralization of hydrogen sulfide with a sodium-derived base. NaSH is a useful reagent for the synthesis of organic and inorganic sulfur compounds.

    Sodium hydrosulfide 207683-19-0 - MilliporeSigma

    Sodium hydrosulfide hydrate is a hydrated inorganic salt of sodium. It participates in the synthesis of (E)-2-cyano-2-(thiazolidin-2-ylidene)ethanethioamide. Application. It may be used as a sulfur nucleophile to induce the C-S bond formation in α,β-dichloro vinyl ketones to form 5- to 8-membered cyclic thioethers.

    SODIUM HYDROSULFIDE, SOLUTION | CAMEO Chemicals

    A chemical base. Reacts with acids to release flammable and toxic gaseous hydrogen sulfide. As long as the solution is kept strongly alkaline, pH > 10, there is very little release of H2S. At pH = 7, the percent concentration of H2S released is close to 80%.

    Sodium Hydrosulfide Handbook - AusIMM

    Sodium hydrosulfide, NaHS, is a highly alkaline liquid with a pH range of 11.5 to 12.5. The liquid solution is typically yellow to dark green in color and has a strong hydrogen sulfide (rotten egg) odor. Solutions of NaHS are considered stable in normal transportation.

    SODIUM HYDROSULFIDE, SOLID, WITH LESS THAN 25

    Sodium hydrosulfide is a colorless to light yellow crystalline solid or fused mass. It is corrosive to skin and metal. Used in paper pulping, manufacturing dyes, and dehairing hides.

    Right to Know Hazardous Substance Fact Sheet - The …

    Sodium Hydrosulfide is a colorless to lemon-colored, crystalline (sand-like) solid with a rotten egg odor. It is used to make heavy water for nuclear reactors, as a chemical intermediate and pulping agent in making paper, and in making dyes and other chemicals.

    Sodium hydrosulfide technical, =90 140650-84-6 - MilliporeSigma

    Sodium hydrosulfide monohydrate technical, ≥90%; CAS Number: 140650-84-6; Synonyms: Sodium bisulfide,Sodium hydrogen sulfide monohydrate; Linear Formula: NaSH · H2O at Sigma-Aldrich