Question

describes how HNO2 acts as an acid in aqueous solution?

Answer 1

Answer:

Explanation:Nitrous acid (as sodium nitrite) is used as part of an intravenous mixture with sodium thiosulfate to treat cyanide poisoning. It is on the World Health Organization's List of Essential Medicines, a list of the most important medications needed in a basic health system. There is also research to investigate its applicability towards treatments for heart attacks, brain aneurysms, pulmonary hypertension in infants, and Pseudomonas aeruginosa infections.

DrugBank

Nitrous acid (HNO2). A weak acid that exists only in solution. It can form water-soluble nitrites and stable esters. (From Merck Index, 11th ed)

MeSH

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Answer 2

HNO₂ acts as an acid in aqueous solution as follows:

- In aqueous solution, it dissociates to give an H⁺ and NO₂⁻.

- The proton attaches with water to form a hydronium ion.

- The reaction is given as:

HNO₂ + H2O ⇄ NO₂⁻ + H₃O⁺

- Hence, the solution becomes acidic due to it.

- But the dissociation of HNO₂ is not complete.

- So, it acts as a weak acid.