RICHARDS AND RO^VE. — SPECIFIC HEATS OF LIQUIDS. 



191 



TABLE II. 

 Water Staxdardization. Series I and II. 



AV 

 efficient of the reaction ^^ under these circumstances is -49.5 cal- 

 AT 



cries. 



From time to time, in order to sliow that the acid was remaining 

 constant in composition and that each of the two-Hter flasks used for 

 the storage of the acid contained material of the same concentration, 

 the experiments were repeated at other temperatures. With the help 

 of the temperature coefficient just calculated, one finds that at 20°.00 

 the reaction should evolve 16,982 calories, at 20.47°, 16,957 calories, 

 and so on. It was thus possible to compare the observed evolution 

 of heat at different temperatures with that calculated in this way, 

 and thus use these determinations as a check on the concentration of 

 the sulphuric acid, — or, viewed from the other standpoint, as a means 

 of testing the accuracy of the temperature coefficient. The experi- 

 ments thus made from time to time are given in the following table. 



