Chemistry:Thallium(I) hydroxide
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Names | |
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IUPAC name
thallium(I) hydroxide
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Other names
thallous hydroxide
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Identifiers | |
3D model (JSmol)
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ChemSpider | |
EC Number |
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PubChem CID
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UNII | |
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Properties | |
TlOH | |
Molar mass | 221.39 g·mol−1 |
Appearance | yellow needles |
Density | 7.44 g/cm3 |
Melting point | decomposes at 139°C |
34.3 g/(100 g) at 18°C | |
Thermochemistry | |
Std molar
entropy (S |
88.0 J·mol−1·K−1 |
Std enthalpy of
formation (ΔfH⦵298) |
−238.9 kJ·mol−1 |
Hazards | |
Main hazards | Very toxic
Corrosive Dangerous for the environment |
GHS pictograms | ![]() ![]() ![]() |
GHS Signal word | Danger |
H300, H330, H373, H411 | |
P260, P264, P270, P271, P273, P284, P301+310, P304+340, P310, P314, P320, P330, P391, P403+233, P405, P501 | |
NFPA 704 (fire diamond) | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
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Infobox references | |
Tracking categories (test):
Thallium(I) hydroxide, also called thallous hydroxide, TlOH, is a hydroxide of thallium, with thallium in oxidation state +1.
Synthesis
Thallium(I) hydroxide is obtained from the decomposition of thallium(I) ethoxide in water.[3]
- CH
3CH
2OTl + H
2O → TlOH + CH
3CH
2OH
This can also be done by direct reaction of thallium with ethanol and oxygen gas.
- 4 Tl + 2 CH
3CH
2OH + O
2 → 2 CH
3CH
2OTl + 2 TlOH
Another method is the reaction between thallium(I) sulfate and barium hydroxide.
- Tl
2SO
4 + Ba(OH)
2 → 2 TlOH + BaSO
4
Properties
Thallous hydroxide is a strong base; it dissociates to the thallous ion, Tl+
, except in strongly basic conditions. Tl+
resembles an alkali metal ion, such as Li+
or K+
.
References
- ↑ Lide, David R. (1998). Handbook of Chemistry and Physics (87 ed.). Boca Raton, Florida: CRC Press. pp. 4–89, 5–16. ISBN 0-8493-0594-2.
- ↑ "Thallium hydroxide" (in en). https://pubchem.ncbi.nlm.nih.gov/compound/160963#section=Safety-and-Hazards.
- ↑ Brauer, Georg; Baudler, Marianne (1975). Handbuch der Präparativen Anorganischen Chemie, Band I. (3rd ed.). Stuttgart: Ferdinand Enke. pp. 883. ISBN 3-432-02328-6.
![]() | Original source: https://en.wikipedia.org/wiki/Thallium(I) hydroxide.
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