Question

What are the [H₃O⁺] and the pH of a buffer that consists of 0.55 M HNO₂ and 0.75 M KNO₂ (Kₐ of HNO₂ = 7.1X10⁻⁴)?

Answer 1

The pH of the buffer that consists of 0.55 M HNO₂ is 3.3, which is acidic.

What is the common name for 0.55 M HNO₂?

The common name for 0.55 M HNO₂ is Nitrous acid. Only in solution, the gas phase, and in the form of nitrite salts is nitrous acid, a weak and monoprotic acid, known to science. Amines are converted into diazonium salts using nitrous acid. To produce azo colors, azo coupling processes use the resultant diazonium salts as reagents. A nitrogen oxoacid is a nitrous acid. It is a nitrite's conjugate acid. To treat cyanide poisoning, sodium thiosulfate is combined intravenously with nitrous acid (as sodium nitrite).

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