424 MM. Svanberg and Struve on the Atomic Weight 



under water exhibit a strong silvery lustre. It is readily soluble 

 in water. 



Another salt crystallizes in beautiful acute rhombohedrons, 

 which have an adamantine lustre, are very sparingly soluble in 

 cold, more readily soluble in hot water; on evaporating its so- 

 lution it is converted for the greater part into the trimolybdate. 

 It fuses at a red heat, and solidifies on cooling with a steel- 

 gray colour and a strong lustre. 



A third salt sometimes separates when the mother-ley ob- 

 tained after precipitating with nitric acid is somewhat warmed ; 

 it forms shining four-sided prisms. 



Soda Salts. 



Neutral Molybdate of Soda. — Formula of the crystallized 

 saltNaO, MoO 3 + 2HO. 



To prepare this salt 5*491 grms. MoO 3 were fused with 

 4*074 grms. anhydrous carbonate of soda, being exactly the 

 proportion required for the production of the neutral salt. 

 On cautiously raising the temperature, mutual reaction takes 

 place with violent evolution of carbonic acid, and at a red 

 heat the whole mass forms a perfect liquid ; the crucible was 

 placed over sulphuric acid to cool, when the whole solidified 

 to a crystalline mass. It dissolved easily and entirely in water, 

 and on evaporating the solution by heat, the greater portion 

 of the salt separated in a crystalline state. The crystals were col- 

 lected on a filter, washed with very little water, dried as quickly 

 as possible between folds of paper, and then left for twenty-four 

 hours over caustic lime and sulphuric acid. They form small 

 rhombohedrons with very acute angles, fuse readily, giving off 

 their water of crystallization, and solidify on cooling to a cry- 

 stalline mass. The salt is readily soluble in water. 



Analysis. — 1*280 grm. salt gave 0*1927 water and 0*7542 

 sulphate of soda = 0*3301 soda. 



a. Calc. b. Calc. Found. 



1 at. Soda 389729 25-919 389*729 26-147 25788 



1 at. Molybdic acid .. 888-966 59-120 875*829 58-760 59-207 



2 at. Water 224-958 14961 224-958 15-093 15005 



1503-653 100-000 1490-516 100000 100-000 

 and in the anhydrous salt — 



a. Calc. b. Calc. Found. 



1 at. Soda 389-279 30479 389-729 30795 30358 



1 at. Molybdic acid .. 888-966 69-521 875-829 69-205 69-642 



1278-965 100000 1265*558 100 000 100000 



Bimolybdate of Soda. — Formula of the crystallized salt NaO, 

 2M0O 3 + HO. To prepare this salt 2*4325 grms. molybdic 

 acid were fused with 0*919 grm. of dry carbonate of soda, 



