Rubidium hydroxide
| Names | |
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| IUPAC name
Rubidium hydroxide
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| Identifiers | |
CAS Number
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3D model (JSmol)
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| ChEBI | |
| ChemSpider | |
| ECHA InfoCard | 100.013.806 |
PubChem CID
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CompTox Dashboard (EPA)
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InChI
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SMILES
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| Properties | |
Chemical formula
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RbOH |
| Molar mass | 102.475 g·mol−1 |
| Appearance | white solid, hygroscopic |
| Density | 3.1 g/mL at 25 °C |
| Melting point | 382 °C (720 °F; 655 K) dec |
| Boiling point | 1,390 °C (2,530 °F; 1,660 K) |
Solubility in water
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173 g/100 mL (30 °C) |
| Solubility | soluble in ethanol |
| Acidity (pKa) | 15.4[1] |
| Thermochemistry | |
Std enthalpy of
formation (ΔfH⦵298) |
−413.8 kJ/mol |
| Hazards | |
| Occupational safety and health (OHS/OSH): | |
Main hazards
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Corrosive |
| GHS labelling:[2] | |
Pictograms
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Hazard statements
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H302, H312, H314, H332 |
Precautionary statements
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P260, P264, P270, P271, P280, P301+P317, P301+P330+P331, P302+P352, P302+P361+P354, P304+P340, P305+P354+P338, P316, P317, P321, P330, P362+P364, P363, P405, P501 |
| NFPA 704 (fire diamond) | 
3
0
1 ALK |
| Flash point | Non-flammable |
| Related compounds | |
Other cations
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Lithium hydroxide Sodium hydroxide Potassium hydroxide Cesium hydroxide |
Related compounds
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Rubidium oxide (+1) |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
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Rubidium hydroxide is the inorganic compound with the formula RbOH. It consists of rubidium cations and an equal number of hydroxide anions. It is a colorless solid that is commercially available as aqueous solutions from a few suppliers. Like other strong bases, rubidium hydroxide is highly caustic. Rubidium hydroxide is formed when rubidium metal reacts with water.[3]
Uses
Rubidium hydroxide is rarely used in industrial processes because potassium hydroxide and sodium hydroxide can perform nearly all the same functions of rubidium hydroxide. Metal oxide catalysts are sometimes modified with rubidium hydroxide.[3]
References
- ^ "Sortierte Liste: pKb-Werte, nach Ordnungszahl sortiert. - Das Periodensystem online" (in German).
- ^ PubChem. "Rubidium hydroxide". pubchem.ncbi.nlm.nih.gov. Retrieved 2026-01-19.
- ^ a b Lenk, Winfried; Prinz, Horst; Steinmetz, Anja (2010). "Rubidium and Rubidium Compounds". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a23_473.pub2. ISBN 978-3-527-30673-2.
- "Rubidium compounds: dirubidium oxide". WebElements: the periodic table on the web. WebElements. Retrieved 16 November 2011.
- "Rubidium hydroxide". ChemExper Chemical Directory : catalog of chemicals and suppliers. ChemExper. Retrieved 16 November 2011.