Question

Help please chemistry question

Answer 1

D.
`K_(a) = \frac{[\text{H}^(+)][\text{NO}_(2)^(-)]}{[\text{HNO}_(2)]}`

Step-by-step explanation:

The general form of an equilibrium constant expression is

`K = \frac{[\text{Products}]}{[\text{Reactants}]}`

In the equilibrium

HNO₂ ⇌ H⁺ + NO₂⁻

The products are H⁺ and NO₂⁻, and the reactant is HNO₂.

∴
`K_(a) = \frac{[\text{H}^(+)][\text{NO}_(2)^(-)]}{[\text{HNO}_(2)]}`