Dinitrogen trioxide

Nitrous

Deep dark blue liquid at -21 ° C

Unstable at standard conditions

-100.7 ° C

-40 - 3 ° C ( partial decomposition )

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Dinitrogen trioxide is a chemical compound having the formula N2O3 from the group of oxides of nitrogen. It is the formal anhydride of nitrous acid. Below 3 ° C it exists as a deep blue liquid, which solidifies at -100.7 ° C to a pale blue solid.

Properties

Dinitrogen trioxide is unstable at normal pressure is above -40 ° C, as it is dissociated during boiling in NO and NO 2 (or its dimer N2O4 ). Wherein the boiling point of the mixture rises to 3 ° C.

• ΔfH0gas: 91.2 kJ · mol -1
• S0gas, 1 bar: 314.63 J · (mol · K ) -1

Production

Dinitrogen trioxide is by contact of the same amounts, nitric oxide ( NO) and nitrogen dioxide (NO2 ), wherein the mixture is cooled to below -21 ° C. The two gases react with each other and combine to form the deep blue liquid dinitrogen trioxide having the formula N2O3.

A convenient method of preparation is to put powdered arsenic trioxide with nitric acid:

Use

Dinitrogen trioxide is the anhydride of nitrous acid HNO2. This also occurs when dinitrogen trioxide is introduced into water ( H2O). However, it breaks down in not timely processed into nitric oxide NO and nitric acid HNO3. Nitrites, the salts of nitrous acid may be sometimes obtained by addition of dinitrogen trioxide to the respective bases.

Safety

Dinitrogen trioxide and its decay products are very toxic by inhalation. Upon contact with the eye, chemical burns are the result.