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              2. Calcitulation of pH and pOH for weak Acids and Baes



                                 +
              a. calculate H   from a solution of weak acid

               If  a  weak  acid  if  formulated  as  HA.  Its  ionization  in  aqueous

               solution can be represented by the following equation.
                                                          +
                                                                        -
                                       HA         ⇌    H            +   A
                                                                        (aq)
                                           (aq)
                                                         (aq)
               If  we  let  x  be  the  amount  of  HA  that  ionizes  per  liter,  we  can
               construct the following concentration table.

















               At equilibrium the acid ionization constant can be represented by

               the following equation















               Because Ka of a weak acid is so small, x is also small. Therefore



                                                               since
                  and






















           Bahasa Inggris Kimia (PKIM3139)                                                                       33
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