112 



HYDRATES IN AQUEOUS SOLUTION. 

 TABLE 94. ACETIC ACID Continued. 



OXALIC ACID. 



The freezing-point lowerings produced by oxalic acid decrease with increase 

 in concentration, falling below the theoretical value if oxalic acid was not 

 dissociated (table 95). Oxalic acid is, however, very appreciably dissociated, 

 as is shown under "Conductivity measurements," table 95. 



When the corrected molecular lowering L', table 95, is compared with 

 the molecular lowering L, calculated on the basis of the dissociation of the 

 acid as given under "Conductivity measurements," it will be seen that the 

 value found experimentally is much less than the calculated value, at all 

 the dilutions studied. This shows that oxalic acid, like acetic acid, under- 

 goes polymerization in solution, and there is no evidence for or against the 

 existence of hydrates in such solutions. The freezing-point and conductivity 

 data for oxalic acid are given in figs. 62 and 63. 



TABLE 95. OXALIC ACID. 



