MANGANESE NITRATE. 



75 



MANGANESE NITRATE. 



The results formerly obtained by Jones andGetman* for manganese nitrate, 

 were somewhat out of keeping for a salt with 6 molecules of water of crys- 

 tallization. The freezing-point lowerings produced by this substance were 

 too small. Suspecting that there must have been some error as far as this 

 substance is concerned, the work was repeated. The following results were 

 obtained : 



From table 56 it will be seen that manganese nitrate gives just about 

 the same lowering of the freezing-point as other salts with 6 molecules of 

 water of crystallization, and really falls right in line with the relation that 

 has been shown to hold in such a large number of cases. In order to avoid 

 any possibility of error, a second, entirely new solution of manganese nitrate 

 was prepared, and a fresh standardization of this solution was made. The 

 freezing-point lowerings produced by solutions made from this newly stand- 

 ardized solution, were then determined, the results being recorded under B 

 in table 56. It will be seen that these agree satisfactorily with the results 

 under A. The error in the original work with this substance was probably 

 due to a mistake in standardization. 



TABLE 56. MANGANESE NITRATE. 



*Amer. Chem. Journ., 31, 313 (1904). 



