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]
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3D model (JSmol)
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| Properties | |
| H2O2Ra | |
| Molar mass | 260 g·mol−1 |
| Appearance | colorless crystals |
| soluble | |
| Related compounds | |
Related compounds
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Barium hydroxide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Synthesis
edit- A reaction of radium metal with water:[citation needed]
- 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:[citation needed]
- RaO + H2O → Ra(HO)2
- The compound can also be prepared by reacting radium nitrate with NaOH in solution.[citation needed]
Physical properties
editRadium 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.[3]
Radium hydroxide is a caustic, toxic, and corrosive substance. It is significantly more toxic than barium hydroxide (Ba(OH)2) and strontium hydroxide (Sr(OH)2).
References
edit- ^ 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.
- ^ 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. Bibcode:2019JChTh.128..362M. doi:10.1016/j.jct.2018.08.037. S2CID 105458974.
{{cite journal}}: CS1 maint: multiple names: authors list (link) - ^ 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.