Write the equilibrium constant expression for this reaction:2H+(aq)+SO2−4(aq) → H2SO4(aq)

The equilibrium constant expression for the given reaction is written as the ratio of the concentrations of the products to the concentrations of the reactants, each raised to the power of its stoichiometric coefficient in the balanced chemical equation.

For the reaction: 2H+(aq) + SO4^2-(aq) → H2SO4(aq)

The equilibrium constant expression (K) would be:

K = [H2SO4] / ([H+]^2 * [SO4^2-])

Where: [H2SO4] is the concentration of H2SO4 at equilibrium, [H+] is the concentration of H+ at equilibrium, [SO4^2-] is the concentration of SO4^2- at equilibrium.

The concentrations are usually measured in moles per liter (Molarity).