Question

I 2) For the chemical reaction CO2(g) + H2O(0) S H2CO3(aq) give the correct expression for Kc, Kn, and K, or explain why such an expression cannot be given. [12 points)

Answer 1

2. The where a Halez a H2603 given chemical reaction is CO2(g) + H20(1) I H2CO3(ar) The equilibrium constant K for this express reaction can be expressed represents activity of k= H2003, a cor represents achvity of a H2o and anzo represents activity of 420 Now since 420 is liquid, so activity of H2ois 1. ...a tro=1 Therefore expression turns to the following form. cond a con K- a H2003 a coz ke is the equilibrium constant in terms of concentration. The concentration is molarity expressed as moles per liter [M=mol/l]. The expression for Kc is shown belowa [H2003 H2O is liquid, so omitted from Kc = [CO2 this expression - same like expression of k [#2003] is concentration of H2CO3, and [Coz] is concentration of coz Kp is the equilibrium constant interms of partial pressure of the reactants and products present in gas phase Here only the reactant coz is present in gas phase, Has is liquid and 14263 is present in aqueous phase. Therefore expression for Kp is as follows - 2 Kp= Peor Where Pcoz is partial pressure of con