US 2014/0021404 Al  Jan. 23, 2014 Sheet 2 of 22  Patent Application Publication  FIG.2  t20 ""’f’• -~--ur-~.  ~xF•  ~  .. -~--r-~~~  .. •’  .•• ..... •=••••••••••••e<~r••w-....,..y~  ...  ex.•.•~  (a) !Me0 1 H  -80  - ~  C  60  .c:  a,  •- (2)  ;:  40  ..  2  Amount of acid added  (f~ [H  +] ,/  (2’* [CQ:12’-]))  XI 