Semiheavy water

Semiheavy water is the result of replacing one of the protium in light water to deuterium.[1] It exists whenever there is water with light hydrogen (protium, 1H) and deuterium (D or 2H) in the mix. This is because hydrogen atoms (hydrogen-1 and deuterium) are rapidly exchanged between water molecules. Water containing 50% H and 50% D in its hydrogen contains about 50% HDO and 25% each of H2O and D2O, in dynamic equilibrium.[2] In regular water, about 1 molecule in 3,200 is HDO (one hydrogen in 6,400 is D). By comparison, heavy water D2O[3] occurs at a proportion of about 1 molecule in 41 million (i.e., one in 6,4002). This makes semiheavy water far more common than "normal" heavy water.

Semiheavy water
Names
IUPAC name
(O-2H1)Water
Other names
Deuterium hydrogen monoxide
Deuterium hydrogen oxide, Water-d1 , Water-d
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
Properties
H2HO (also HDO)
Molar mass 19.0214 g mol−1
Appearance Very pale blue, transparent liquid, very similar to regular water
Density 1.054 g cm−3
Melting point 3.81 °C (38.86 °F; 276.96 K)
Boiling point 101.42 °C (214.56 °F; 374.57 K)
miscible
log P −0.65
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references

The freezing point of semiheavy water is close to the freezing point of heavy water. (3.8°C)

References
  1. Tashakor S (2016-09-28). "Neutronic Investigation of Semi-Heavy Water Application in Hplwr New Flow Pattern". CNL Nuclear Review: 1–5. doi:10.12943/CNR.2016.00019.
  2. Goncharuk VV, Kavitskaya AA, Romanyukina IY, Loboda OA (June 2013). "Revealing water's secrets: deuterium depleted water". Chemistry Central Journal. 7 (1): 103. doi:10.1186/1752-153X-7-103. PMC 3703265. PMID 23773696.
  3. "Heavy water | chemical compound". Encyclopedia Britannica. Retrieved 2019-04-24.

Further reading
  • Schwarzer D, Lindner J, Vöhringer P (October 2005). "Energy relaxation versus spectral diffusion of the OH-stretching vibration of HOD in liquid-to-supercritical deuterated water". The Journal of Chemical Physics. 123 (16): 161105. doi:10.1063/1.2110087. hdl:11858/00-001M-0000-0012-E7B7-2. PMID 16268674.
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