20 



In percent: 



H 



Se03 .... 

 HjO by 100» . 

 H,0 by 230° . 



100.00 945 100.00 



Spec. Grav: 



1.6569 gram, crystals, t" 10" sp. Gr. 3.009 

 1.6110 » » » » » » 3.010 



Molee. vol.: 314. 



III. Sm^3Se()^ anhydrous salt was obtained by heating the cry- 

 stallised salt II. to 230". 



Spec. Grav: 



1.2165 gram, temp. 10", sp. Gr. 4.077. 

 Molecular volume: 178.8. 



Seienate of samarium and potassium 



SmK2Se04 + 3H3 0. 



This double salt crystallises from the mixed solutions of the simple 

 salts by spotaneous evaporation at a summer heat in small topas-yellow 

 needles, attached to semi-sphaïrical masses. The salt is easily soluble 

 in water. 



0.6512 gram lost scarcely anything at 100", but 0.0666 gram H^O 

 at 220". It gave 0.1946 gram Se, 0.2123 gram Sm,0:^ and 0.1066 gram 

 H,SO,. 



2.9465 gram lost by 230" 0.3037 gram H^O. 



In percent: „ , 



' Calc 



Sm^Oa 32.60 — 348.0 32.89 



SeOä 48.04 — 508.0 48.01 



K,0 8.85 — 94.2 8.90 



H,0 10.23 10..37 108.0 10.20 



99.72 1058.2 100.00 



