The nitrites are the salt S of the Nitrous acid . The nitrous acid is an unstable acid of formula HNO₂. The formula of the ion nitrite is NR O ₂^-.

The presence of nitrites in the Sang prevents the Hémoglobine from suitably fixing the Oxygène. It is the blue disease of the infant , more learnedly called methemoglobinemy . This is why the content nitrites in the Drinking water is regulated and, indirectly that of the Nitrate S because of their capacity to be transformed into nitrites.

Not to confuse, for example:

• the Nitrate of sodium Na NR O ₃,
• the Nitrite of sodium Na NR O ₂,
• the Nitride of sodium Na ₃ NR
• the Azide of sodium Na NR ₃.

Properties

The ion nitrite has a behavior very different from the ion nitrates, in particular, it binds to metals. The alkaline nitrites are water soluble and Hygroscopique S. Examples of nitrites:

• Nitrite of sodium NaNO₂
• nitrite of calcium Ca (NO₂) ₂.
• nitrite of potassium KNO₂

Obtaining

The alkaline nitrites are obtained by decomposition of corresponding nitrates towards 1.200 °C. One currently prepares them by synthesis during the production of the nitric Acid .

Uses

• Conservation and treatment of the meat.
• Agriculture: The Bactérie Nitrosomonas converts the Ammoniac plants resulting from nitrogen, into Dioxide nitrogen then Nitrobacter transforms nitrite into nitrate absorptive by the roots.
• Transformation of salt amines of diazonium, bases industry of the organic dyes

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