HENDELSON - HASSELBACH EQUATION ( TASK 4 )

Calculate the pH of a mixture of 0.1M acetic acid and 0.2M sodium acetate. ( The pKa of acetic is 4.76 )

CH3COOH  - CH3COO- + H+

pH = pKa + log [ CH3COO ]

                          ______________

                          [ CH3COOH ]

     = pKa + log [ 0.2 ]

                         _____

                         [ 0.1 ]

     = pKa + log 0.30

     = 4.76 + 0.301

    

     = 5.061