Tin(II) hydroxide

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Tin(II) hydroxide
Tin(II) hydroxide.JPG
CAS number 12026-24-3
ChemSpider 19989070
Molecular formula Sn(OH)2
Molar mass 152.73 g/mol
Std molar
155 J·mol−1·K−1[1]
Std enthalpy of
−561 kJ·mol−1[1]
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Tin(II) hydroxide, Sn(OH)2, also known as stannous hydroxide, is a chemical compound of tin in the +2 oxidation state. Pure Sn(OH)2 is prepared by reacting for example (CH3)3SnOH with SnCl2 in an aprotic solvent:[2]

2 Me3SnOH + SnCl2 → Sn(OH)2 + 2 Me3SnCl

There had been confusion as it had been believed that Sn(OH)2 was precipitated when a tin(II) salt is reacted with an alkali hydroxide such as NaOH, but this product was determined analytically to be hydrated tin(II) oxide, being either 5 SnO • 2 H2O or 3 SnO • H2O.[3] The structure of pure Sn(OH)2 is not known.[2]

Stannous hydroxide is easily oxidized to stannic acid (Sn(OH)4) by air since tin is often found in oxidation state +4.


  1. ^ a b Zumdahl, Steven S. (2009). Chemical Principles 6th Ed. Houghton Mifflin Company. p. A23. ISBN 0-618-94690-X. 
  2. ^ a b Holleman, A. F.; Wiberg, E. (2001), Inorganic Chemistry, San Diego: Academic Press, ISBN 0-12-352651-5 
  3. ^ Structure of Tin(II) "Hydroxide" and Lead(II) "Hydroxide", R. A. Howie & W. Moser, Nature 219, 372 - 373 (27 July 1968); doi:10.1038/219372a0