Calculate the pH after 0.013 mole of gaseous HCl is added to 272.0 mL of each of the following buffered solutions. (Assume that all solutions are at 25°C.)

(a) 0.080 M C5H5N and 0.19 M C5H5NHCl


(b) 0.72 M C5H5N and 1.52 M C5H5NHCl