Formic acid is a weak acid found in insect stings. It partially dissociates in water according to the reaction HCHO₂ ⇌ CHO₂⁻ + H⁺. The equilibrium constant describing the dissociation is Kₐ = [H⁺]/[CHO₂⁻]
If a solution of formic acid contains 0.2 M HCHO₂, 0.006 M CHO₂⁻, and 0.006 M H⁺, what is the Kₐ of the acid?
