30 The Philippine Journal of Science 1913 



at room temperatures. The amount is so small that it is neg- 

 ligible in the consideration of the rate of saponification. 



2. The constant for the hydrolytic dissociation of sodium 

 methyl salicylate is about 0.001, which is the value given by 

 Goldschmidt. 



3. The solubilities of methyl benzoate and the methyl ether 

 of methyl salicylate in water at 30° are 0.01568 and 0.0371, re- 

 spectively. The solubilities of methyl salicylate in water at 30° 

 and 100° are 0.005 and 0.0117, respectively. 



4. The saponification constants for methyl benzoate and the 

 methyl ether of methyl salicylate in homogeneous solution cal- 

 culated according to the equation for reactions of the second 

 order are 5.411 and 2.593, respectively. In nonhomogeneous so- 

 lution, calculated according to the equation for reactions of the 

 first order, they are 4.529 and 2.029, respectively; therefore, 

 the saponification constants of difficulty soluble esters can be 

 approximated by the second method. 



5. The rate of saponification of a difficultly soluble ester, when 

 the ester is present in excess of its solubility, is not affected by 

 contact action. 



6. The saponification velocity constant of methyl salicylate 

 with sodium hydroxide in nonhomogeneous solution was de- 

 termined to be 6.36, and that of sodium methyl salicylate was 

 found to be 0.1605. 



7. The saponification of methyl benzoate and methyl salicylate 

 in sodium carbonate solution has been studied for purposes 

 of comparison with the above data. 



8. The affinity constant of methyl salicylate calculated from 

 the conductivity measurements at 30° is of the magnitude 10 -11 . 

 This value agrees with that calculated from the hydrolysis con- 

 stant of the sodium salt. 



9. The hydrolysis of methyl salicylate in pure water at 30° 

 and 100° has been investigated by measurements of the con- 

 ductivity of the solutions. At 30° the rate is 4.6-10 7 ; and at 

 100 c , 3.6-10" 4 . 



