Atorhic Volume and Specifii'^d^^nty. 



a iiumber almost identical with ttve^j^^Wj^iental resuM r '^ 

 this vicAv, then, anhydrous doiiSle sulphates aj-e consntute 

 on the type of red chromate of potash, the two volumes of. 

 CrOy being replaced by the two volumes of MO, SO^. Ah^j 

 hydrous alum was found to have a volume of 116*4 insteaa"^ 

 of 111*4, but would be reconciled with theory, if we supposed.^ ' 

 it to contain the peculiar KO, SOo analogous to KO, QrOoS 

 m this case the theoretical volume would be 11.6'3. , ...^ -.^ 



Section VI. .aiaamiisqxD 99iri:t ^Ai 



-iiyH io 9mijl(>7 ja^ '^ 'Carbmdies"''^^ ^oVioo-n wsiv aiilT 



grains of carbonate of potash in 1000 grains of water, the ii^:^^ 

 crease was 4*6 at 62° ; the atomic volume in solution is there-^^j 

 fore 9*2. The same quantity of salt thrown into turpentin^,,, 

 caused, in various experiments, an increase of 16*5 ; thisj^ 

 makes the volume of the jeq^^iyal^nt ^33;9^,,aj:}(^,th^,^p^^^ 

 gravity of the salt 2-103. Z'fA,^,'^J^ !:-.forti 



Bicarbonate of Potash, KO, h6, SCO^ = 100-6.— I^h^,^. 

 fourth part of an equivalent (25*1 grains) dissolved in 1000., 

 grains of water, at 61°, with an increase of 8*9, and in another 

 experiment of 9*0. The mean of these results, 8*95, gives 

 as the volume of the equivalent in solution, 35*8. The same 

 quantity of salt, thrown into turpentine, gave an increase of 

 12*0, in various experiments, Mhich gives for the specific 

 volume of the salt 48*0, and for its specific gravity 2*092. 

 As this salt was one of the very few substances used in this 

 inquiry not prepared by ourselves, we take the mean of our 

 own result, and the only other recorded specific gravity of 

 which we are aware, viz. that by Gmelin, 2*012, and adopt 

 49*0 as the correct volume, and 2*052 as the specific gravity. 



Bicarbonate of Ammonia, HO, NH4O, 2C02=79-3. — This 

 salt was made by exposing the carbonate of the shops to the 

 air until it ceased to emit smell, and then crystallizing the 

 remainder. On dissolving 19*82 grains, the fourth of an 

 equivalent, in 1000 grains of water, the increase was 9*0 at 

 55°, and 9*4 in another experiment at 62°. The mean result 

 gives 36*8 as the volume of the salt in solution. - ■ 



On immersing 19*82 grains of the salt in turpentine, an itt-io 

 crease of 12*5 was effected, which gives as the volume of tbmi' 

 salt 50*0, and for its specific gravity 1*586. 'Go 



Bicarbonate of Soda, NaO, HO, 2CO2 = 84*64.— On dis^lt 

 solving 42*32 grains of this salt in 1000 grains of water at " 

 67°, an increase of 9*0 was obtained ; this gives for the volume 

 of an equivalent in solution 18*0. On immersing the same 

 quantity of salt in turpentine, the increase was 19*4 and 19*2 



in two experiments. 



Phil, Mag, S. 3. No. 183. Sup2)l, Vol. 27. 



2L 



