PROFESSOR GRAHAM ON THE DIFFUSION OF LIQUIDS. 
833 
37 . Bicarbonate of Potash. 
Time of diffusion 8‘083 days, or double that of hydrate of potash. The water of 
the jars was partially charged with carbonic acid gas, to prevent the decomposition 
of this and the other bicarbonates in the act of diffusion. The usual number of eight 
cells of the 1 and 2 per cent, solutions were diffused, and four cells of the 4 and 8 per 
cent, solutions. The whole diffusates of each proportion were then mixed together, 
and the quantity of bicarbonate of potash diffused for two cells, converted into the 
chloride of potassium, evaporated to dryness and weighed. 
1. r059 per cent, of bicarbonate of potash (HO . CO 2 +KO . CO 2 ), density T00788, 
diffused at 68°‘2, gave 7*66 grs. for two cells. Calculated for I per cent., 7’23 grs. of 
bicarbonate of potash in two cells. 
2. 2*12 per cent, of bicarbonate of potash, density 1*01489, diffused at 62°*2, gave 
14*88 grs. for two cells. Calculated for 2 per cent., 14*05 grs. of bicarbonate of pot- 
ash in two cells. 
3. 4*236 per cent, of bicarbonate of potash, density 1*0288, diffused at 68°*2, gave 
14*15 grs. for 1 cell. Calculated for 4 per cent., 13*36 grs. of bicarbonate of potash 
in one cell. 
4. 8*472 per cent, of bicarbonate of potash, density 1*05600, diffused at 68°*2, gave 
27*55 grs. for one cell. Calculated for 8 per cent., 26*01 grs. of bicarbonate of potash 
in one cell. 
Diffusion of Bicarbonate of Potash 
in 8*08 davs at 
68°*2 ; two cells. 
Grs. 
Ratio. 
From 1 per cent, solution . 
. . 7*23 
1*029 
From 2 per cent, solution 
. . 14*05 • 
2 
From 4 per cent, solution 
. . 26*72 
3*806 
From 8 per cent, solution . 
. . 52*01 
7*408 
38. Bicarbonate of Ammonia. 
Time of diffusion 8*083 days. The usual number of eight cells of the 1 and 2 per 
cent, solutions of this substance were diffused, and four cells of the 4 and 8 per cent, 
solutions. The whole diffusates of each proportion were then mixed together, and 
the quantity of bicarbonate of ammonia, diffused for two cells, determined by an 
alkalimetrical experiment, which was always repeated twice. 
1 . 1*109 per cent, of bicarbonate of ammonia (HO . CO 2 +NH 4 O . CO 2 ), density 
1*00553, diffused at 68°*2, gave 7*66 grs. for two cells. Calculated for 1 per cent., 
6*91 grs. of bicarbonate of ammonia in two cells. 
2. 2*218 per cent, of bicarbonate of ammonia, density 1*01056, diffused at 68°*2, 
gave 15*14 grs. for two cells. Calculated for 2 per cent., 13*65 grs. of bicarbonate of 
ammonia in two cells. 
3 . 4*436 per cent, of bicarbonate of ammonia, density 1 * 02000 , diffused at 68 °' 2 , 
MDCCCL. . 5 o 
