742 ACTIVITY COEFFICIENT OF THE HYDROGEN ION 



5. The velocity in strongly alkaline solutions (pH greater than 

 10) is directly proportional to the hydroxyl ion concentration. 



6. Between pH 2.0 and pH 10.0 the rate of hydrolysis is approxi- 

 mately constant and very much greater than would be calculated 

 from the hydrogen and hydroxyl ion concentration. This may be 

 roughly accounted for by the assumption that the uncombined gelatin 

 hydrolyzes much more rapidly than the gelatin salt. 



