Conductivities of Some Unusual Salts. 



SODIUM DITHIONATE. 



151 



After recrystallizing from conductivity water, 10 c.c. of the sodium 

 dithionate solution was evaporated to dryness in a weighed platinum 

 dish. After heating to dull redness for some time, the dish and contents 

 were cooled over calcium chloride and weighed. From the weight of 

 the sodium sulphate the strength of the original solution of sodium 

 dithionate was calculated. (See table 80.) 



SODIUM PYROPHOSPHATE. 



This salt was dehydrated and weighed after it had been recrystallized. 

 (See table 81.) 



TRISODIUM PHOSPHATE. 



All salts of othophosphoric acid were treated in the same manner. 

 After making a solution of approximately the required strength by 

 weighing the salt, it was standardized by the method of Schmitz. 1 



TABLE 79. Sodium thiosulphate. 



TABLE 80. Sodium dithionate. 



J Zeit. anal. Chem., 45, 512 (1906). 



