Nitrous-acid definitions

A weak inorganic acid, HNO2 , existing only in solution or in the form of its salts.
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An acid, HNO2, known only in solution or in the form of its salts (nitrites)
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A weak inorganic acid existing only in solution or in the form of its salts. It can act either as an oxidizing agent or as a reducing agent. Chemical formula: HNO2.
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(inorganic chemistry) A weak acid, HNO2, known only in solution, or as its salts and esters, the nitrites; it has a linear structure, H-O-N=O.
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