Deuterium oxide

information about deuterium oxide

Deuterium oxide

information about deuterium oxide

This blog provides information about deuterium oxide (heavy water) including the definition of heavy water, heavy water history, its applications and etc.

Deuterium oxide definition

سه شنبه, ۹ آبان ۱۳۹۶، ۱۲:۲۰ ب.ظ

Deuterium oxide or heavy water (D2O) is a form of water that is composed of deuterium and oxygen. Deuterium, also called heavy hydrogen is an isotope of hydrogen with a nucleus consisting of one proton and one neutron, which is double the mass of the nucleus of ordinary hydrogen. The presence of deuterium gives the chemical different nuclear properties, and the increase of mass gives it different physical and chemical properties compared to normal "light water".


Fig 1. Heavy water and water chemical structures

Heavy water and water chemical structures



Ordinary water as obtained from most natural sources contains about one deuterium atom for every 6,760 ordinary hydrogen atoms. and the residual water is thus enriched in deuterium content. The heavy water produced is used as a moderator of neutrons in nuclear power plants. In the laboratory heavy water is employed as an isotopic tracer in studies of chemical and biochemical processes.


Table 1. Physical properties of deuterium oxide

Properties

D2O (Heavy water)

H2O (Light water)

Freezing point

3.82 °C (38.88 °F)

0.0 °C (32 °F)

Boiling point

101.4 °C (214.5 °F)

100.0 °C (212 °F)

Density at STP (g/mL)

1.1056

0.9982

Temp. of maximum density

11.6 °C

3.98 °C[10]

Dynamic viscosity (at 20 °C, mPa·s)

1.2467

1.0016

Surface tension (at 25 °C, N/m)

0.07187

0.07198

Heat of fusion (kJ/mol)

6.132

6.00678

Heat of vaporisation (kJ/mol)

41.521

40.657

pH (at 25 °C)

7.44 ("pD")

7.0

pKb (at 25 °C)

7.44 ("pKb D2O")

7.0

Refractive index (at 20 °C, 0.5893 μm)

1.32844

1.33335


 


Source: 

https://www.britannica.com                 

https://en.wikipedia.org

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