54*2 Linhart — Hydrolysis of Alky I Metallic Sulphates. 





Table I (continued). 





f 





BaS0 4 





iii hours 



in grams 



in grain equiv. 



K 





B 



= 0-5N HC1 





22-3 



0-0554 



0-0237 



0-00713 



48-0 



0-1264 



0-0542 



(0-00765) 



66-7 



0-1644 



0-0704 



0-00719 



95-5 



0-2378 



0-1019 



000742 



139-5 



0-3356 



0-1438 



0-00730 



188-5 



0-4390 



0-1881 



000725 



235-3 



0-5280 



0-2262 



0-00719 



286-8 



0-6214 



0-2662 



0-00719 



ex 



0-7002 



03000 = 

 Table II. 



A 





K for Esters in 1-0 N HC1 





Ba(C 2 H 5 S0 4 ) 



* 



Sr(C 2 H 6 S0 4 ) 2 



Ca(C 2 H 6 S0 4 ) 2 



0-00828 





0-00786 



0-00733 



0-00828 





0-00761 



0-00733 



0-00828 





0-00772 



0-00726 



0-00835 





0-00786 



0-00729 



0-00828. 





0-00789 



0-00729 



0-00832 





0-00786 



0-00726 



Summary. — The rate of decomposition of these esters 

 increases with the increase in the atomic weight of the metal, 

 while it decreases in each case with the increase in the weight 

 of the alkyl group, as is shown in the second paper of this 

 series. 



2. The hydrolytic decomposition in acid solution of the Ba, 

 Sr and Ca salts of methyl, ethyl and propyl sulphuric acids 

 proceeds very slowly at 60° according to the equations : 



M(RS0 4 ) 2 + HOH > MS0 4 + ROM + HRSO, 



HRS0 4 + HOH ±: 

 M(RS0 4 ) 2 + H a S0 4 



H.,SC> + ROH 



-»MSO. 



2HRSO, 



3. In order to obtain an integral equation from which to 

 calculate velocity constants the differential equation must take 

 into account the increase in the acidity of the reacting mixture 

 as well as the hydrolysis of alkyl sulphuric acid resulting from 

 the hydrolysis of the metallic alkyl sulphate. 



*This Journal, xxxiv, 292. 



