Consider a 0.10 mol L-1 HNO2 (aq) acid solution having Ka 5.0 x 10-4 at %3D 25C. a) Write the acid dissociation equation. b) Write the equilibrium expression for the acid dissociation. c) Calculate the [H*] ion concentration assuming the activity coefficient to be close to one. d) Calculate the [H+] ion concentration using the activity coefficients and compare the result with that of calculated with activity coefficient to be close to one. e) Calculate the pH of the solution. f) Calculate the percentage of dissociation in the solution.