Tritiated water

Not to be confused with Heavy water or Semiheavy water.
Tritium oxide
All types of isotopically substituted water molecules have this structure.
Names
IUPAC name
[3H]2-water
Systematic IUPAC name
(3H2)Water
Other names
  • Super-heavy water
  • Tritium oxide
  • Ditritium oxide
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
MeSH tritium+oxide
  • InChI=1S/H2O/h1H2/i/hT2 ☒N
    Key: XLYOFNOQVPJJNP-PWCQTSIFSA-N ☒N
  • [3H]O[3H]
Properties
T2O or 3H2O
Molar mass 22.0315 g·mol−1
Appearance Colorless liquid[1]
Density 1.21 g/mL
Melting point 4.48 °C (40.06 °F; 277.63 K)[3]

[4][5]

Boiling point 101.51 °C (214.72 °F; 374.66 K)
Acidity (pKa) 15.21[2]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Tritiated water is a radioactive form of water in which the usual protium atoms are replaced with tritium atoms. In its pure form it may be called tritium oxide (T2O or 3H2O) or super-heavy water. Pure T2O is a colorless liquid,[1] and it is corrosive due to self-radiolysis. Diluted, tritiated water is mainly H2O plus some HTO (3HOH). It is also used as a tracer for water transport studies in life-science research. Furthermore, since it naturally occurs in minute quantities, it can be used to determine the age of various water-based liquids, such as vintage wines.

The name super-heavy water helps distinguish the tritiated material from heavy water, which contains deuterium instead.

  1. ^ a b "Tritium oxide".
  2. ^ Perrin, D. D., ed. (1982) [1969]. Ionisation Constants of Inorganic Acids and Bases in Aqueous Solution. IUPAC Chemical Data (2nd ed.). Oxford: Pergamon (published 1984). Entry 252. ISBN 0-08-029214-3. LCCN 82-16524.
  3. ^ W. M. Jones (1952). "The Triple Point Temperature of Tritium Oxide". Journal of the American Chemical Society. 74 (23): 6065–6066. doi:10.1021/ja01143a070.
  4. ^ "hydrogen (H) - chemical element". 6 June 2023.
  5. ^ Paesani, Francesco; Yoo, Soohaeng; Bakker, Huib J.; Xantheas, Sotiris S. (5 August 2010). "Nuclear Quantum Effects in the Reorientation of Water". J. Phys. Chem. Lett. 1 (15): 2316–2321. doi:10.1021/jz100734w.