The dissociation constant is the value that tells about the strong and weak acids. The Ka value for Nitrous acid is given as, [H⁺] [NO₂⁻] ÷ [HNO₂]. Thus, option B is correct.
The dissociation constant expresses the quantity of the substance dissolved in a solution that gets dissociated as ions and is equivalent to the fraction of concentration of products to the concentration of the reactant.
The concentration of the dissociated ions of the product is denoted in the numerator, while the concentration of the undissociated ion of the reactant is denoted in the denominator.
The dissociation constant Ka for nitrous acid is given as,
[tex]Ka = \rm \dfrac {[H+] [NO2-]}{[HNO2]}[/tex]
Therefore, option B. [H⁺] [NO₂⁻] ÷ [HNO₂] is the dissociation constant Ka for nitrous acid.
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