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Nitrite
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<p>The nitrite <a href="/facts/Polyatomic_ion/FcPWAyLm">ion</a> has the <a href="/facts/Chemical_formula/hghUtthl">chemical formula</a> NO−2. Nitrite (mostly <a href="/facts/Sodium_nitrite/t5p4YpvJ">sodium nitrite</a>) is widely used throughout chemical and pharmaceutical industries. The nitrite anion is a pervasive intermediate in the <a href="/facts/Nitrogen_cycle/0X1z74dN">nitrogen cycle</a> in nature. The name nitrite also refers to organic compounds having the –ONO group, which are esters of <a href="/facts/Nitrous_acid/xaVd1w2D">nitrous acid</a>. </p>