Question

Calculate partial pressure given ka1, pH and KH

The equation given in the question was:
HCO3-(aq)+H3O+(aq)= CO2(aq)+H2O
Calculate the partial pressure of
CO2.

I think you use :
[H3O+] = ka1x(antilog pH)/(antilog pH)

Then Henrys law:
Equilibrium conc.[G]=Kh(law constant) × pg (partial pressure of gas)

But then I got the concentration of H3O plus in the 1st step, wont I need the conc. ..can I just plug that into Henrys law as the equili rium concentration and solve for Pg(partial pressure)??

Is my 1st equation even right?
Please help thanks!!