ö 



DiDYMIÜM. 11 



IL 0.7400 gram gave 0.7169 gram Agi and 0.1840 gram DiaOj. 

 In percent: ^, , 



^ Cale 



Di^Oä 24.53 24.86 Î66 23.61 



I2O5 70.85 68.85 501 71.27 



H2O — — 36 — 



703 



As the quantity of clidymium exceeds the calculated amount, it 

 looks as if the salt were decomposed by washing with water. 



\ 



Periodate of didymium 



DiI0, + 4H,0. 



A solution of periodic acid gives with the salts of didymium a 

 gelatinous precipitate which, when left in contact with an excess of 

 periodic acid, is changed into a heavy powder, consisting of microsco- 

 pic needles, exactly resembling the corresponding salt of samarium. 

 The salt loses no water at 100°. 



0.6058 gram was reduced with sulphurous acid and gave with 

 nitrate of silver 0.3365 gram Agi. 



0.4307 gram was evaporated with water, containing sulphurous 

 acid, and gave 0.2907 gram Di2 3S04. 



In percent: ,, , 



^ . Calc 



Di^Os 39.18 166 39.43 



I2O7 43.26 183 43.47 



H^O — 72 — 



421 



Spec. Grav: 



0.9296 gram, small crystals, t" 21".2 sp. Grav. 3.755 

 0.5923 » » » » » » 3.761 



Mean of both determinations : 3.758. 

 Molecular volume: 112. 



