Atomic Volume and Specific Gravity. 495 



I. BaCl + 2HOvol. ofsalt 

 II. 



Ill 



Mean . . 39-07 .- 3-144 

 Perchloride of Mercury, Hg CI = 136-9. — The fourth of 

 an equivalent, 34-2 grains, of corrosive sublimate, on being 

 dissolved in 1000 grains of water, gave an increase of 4*6 at 

 a temperature of 62" ; a second experiment with the same 

 quantity was attended with the samej-esult. 



I. II. HgCl, vol. in solution 18*4 

 Half an equivalent (68*45 grains), thrown into a saturated 

 solution of the salt, caused an increase of 11*0 at a tempera- 

 ture of 56°. 



Sp. gr. 

 I. Hg CI. vol. ofsalt 22 ... 6-223 

 Chloride of Hydrogen, HCl = 36-47. — It was of interest to 

 ascertain the volume of hydrochloric acid, in order to com- 

 pare it with the other chlorides of the magnesian metals when 

 dissolved in water. It was natural to expect that the volume 

 of muriatic acid in dilute solutions would be different from that 

 possessed by it in its concentrated state ; and therefore the 

 following experiments must be viewed in this light. Peligot's 

 salt, the bichromate of the chloride of potassium, on dissol- 

 ving in water, was decomposed into bichromate of potash and 

 muriatic acid, and the volume of the latter was obtained by 

 deducting that due to the former salt and adding the volume 

 of water. The fourth part of an equivalent of this salt, 44-75 

 grains, dissolved in 1000 grains of water with an increase of 

 13*5 at 65° ; and of 13'6 in another experiment at 68°. This 

 result gives for the whole volume of the salt when dissolved 

 54-0 and 54'4, from which must be deducted 45*0 for the vo- 

 lume of bichromate of potash, and 9 must be added on ac- 

 count of the equivalent of water. 

 8fftf/ip I. Muriatic acid, in dilute solutions 18*0 



-^'">"'" II. ... ... ... 18-4 



Mean . . I8^ 

 Chloride of Copper, Cu CI + 2HO = 85-18.-"Half an equi- 

 valent, 42'6 grains, was dissolved in 1000 grains of water with 

 an increase of 13-4 at a temperature of 60°; on a second ex- 

 periment, 47 grains occasioned an increase of 14-0 at a tem- 

 perature of 58°. 



I. CuCl + 2HO, vol. in solution 26-8 

 II. ... ... 25;4 



Mean . . 26-1 



