Final answer:
The acidic equilibrium equation for CH₃NH₃⁺ in solution is CH₃NH₃⁺ + H₂O ⇌ CH₃NH₃OH + H₃O⁺. The value of Ka for CH₃NH₃⁺ cannot be determined without additional information.
Step-by-step explanation:
The acidic equilibrium equation for CH₃NH₃⁺ in solution is: CH₃NH₃⁺ + H₂O ⇌ CH₃NH₃OH + H₃O⁺. In this equation, CH₃NH₃⁺ acts as the acid and donates a proton (H⁺) to water, forming CH₃NH₃OH (the conjugate base of CH₃NH₃⁺) and H₃O⁺ (hydronium ion).
To determine the value of Ka for CH₃NH₃⁺, you would need additional information. Ka is the acid dissociation constant, which is a measure of the extent to which an acid donates protons in solution. It can be calculated using the equilibrium expression involving the concentrations of the reactants and products. Without the concentrations or additional data given, we cannot determine the value of Ka.