Calculating K_c for an equilibrium reaction

Calculation:

1.    Calculate the number of moles of NaOH that neutralised both acids in the titration. 

                        C x V /1000

                        0.5 x 6.55 / 1000

                        3.28 x 10^-3 moles

2.    Use the ratio to calculate the number of moles of both acids in the titration. 

                        1 : 1

                        3.28 x 10^-3 moles

3.    Calculate the number of moles of both acids in the original 100cm³ flask. 

                        x 100

                        0.328 moles

4.    Calculate the number of moles of HCl catalyst from activity sheet 17. 

                        C  x  V / 1000

                        0.0100

5.    Calculate the number of moles of CH₃COOH at equilibrium.

                                    Moles of CH₃COOH = Moles of both acids  -  Moles of HCl

                                    Moles of CH₃COOH = 0.328  -  0.0100

                                    Moles of CH₃COOH = 0.318