Radium hydroxide

Radium hydroxide is an inorganic compound of radium, hydrogen, and oxygen with the chemical formula Ra(OH)2.[1] Stability constant of aqueous RaOH+ ion pair at zero ionic strength is equal to 5.[2]

Radium hydroxide
Identifiers
3D model (JSmol)
ChemSpider
  • InChI=1S/2H2O.Ra/h2*1H2;/q;;+2/p-2
    Key: ARVNHJBMBBFPCP-UHFFFAOYSA-L
  • [Ra+2].[O-H].[O-H]
Properties
H2O2Ra
Molar mass 260 g·mol−1
Appearance colorless crystals
soluble
Related compounds
Related compounds
 Barium hydroxide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Synthesis
  • A reaction of radium metal with water:[3]
Ra + 2H2O → Ra(HO)2 + H2
  • The reaction of radium oxide and water can also generate radium hydroxide, and the reaction releases a lot of heat:
RaO + H2O → Ra(HO)2
  • The compound cany also be prepared by reacting radium nitrate with NaOH in solution.

Physical properties

Radium hydroxide forms colorless crystals that dissolve in water better than does barium hydroxide, and has more basic properties.

The compound forms a hydrate of the composition Ra(OH)2·8H2O.[4]

Radium hydroxide is a caustic, toxic, and corrosive substance. Significantly more toxic than are barium hydroxide (Ba(OH)2) and strontium hydroxide (Sr(OH)2).

References
  1. Brown, Paul L.; Matyskin, Artem V.; Ekberg, Christian (1 June 2022). "The aqueous chemistry of radium". Radiochimica Acta. 110 (6–9): 505–513. doi:10.1515/ract-2021-1141. ISSN 2193-3405. S2CID 248301187. Retrieved 8 June 2023.
  2. Matyskin, Artem V.; Brown, Paul L.; Ekberg, Christian (2019). "Weak barium and radium hydrolysis using an ion exchange method and its uncertainty assessment". Journal of Chemical Thermodynamics. 128: 362–371. doi:10.1016/j.jct.2018.08.037. S2CID 105458974.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  3. "Alkaline Earth Hydroxide - an overview | ScienceDirect Topics". ScienceDirect. Retrieved 8 June 2023.
  4. Schweitzer, George K.; Pesterfield, Lester L. (14 January 2010). The Aqueous Chemistry of the Elements. Oxford University Press. p. 448. ISBN 978-0-19-974219-6. Retrieved 8 June 2023.
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