Sodium hydrosulfide



Sodium hydrosulfide
Other names sodium bisulfide, sodium sulfhydrate, sodium hydrogen solfide and Nash
Identifiers
CAS number 16721-80-5
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)
Infobox disclaimer and references

Sodium hydrosulfide is the oxygen, converting mainly to polysulfides, indicated by the appearance of yellow.

Crystalline NaHS undergoes two monoclinic. RbHS and KHS 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 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, and also in the leather industry for the removal of hair from hides.

References

  1. ^ Haarmann, F.; Jacobs, H.; Roessler, E.; Senker, J. "Dynamics of Anions and Cations in Hydrogensulfides of Alkali Metals NaHS, KHS, RbHS: A Proton Nuclear Magnetic Resonance Study" Journal of Chemical Physics (2002) Volume 117, pages 1269-1276.
  2. ^ Eibeck, R. I. Sodium Hydrogen Sulfide" Inorganic Syntheses, volume 7, p 128-131, 1963. ISBN 978-0-88275-165-8.
 
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