STOKES.] 
TRTMETAHIOSPHIMIO ACID. 
101 
sible to obtain a single satisfactory analysis, but the following data 
may be mentioned: 
A salt obtained by decomposing an ethereal solution of phosphorus 
chloronitride with excess of baryta water consisted of a pulverulent, 
indistinctly crystalline substance for which the ratio P : 13a = 6 : 4.48 
was found, w r hile the calculated ratio for neutral salt is (> : .'». 
The potassium salt, precipitated by ammoniacal barium chloride, 
gave a preparation in which P : Ba = 6 : 3.08. 
Triphosphonitrilic tetrachlorhydrine gave a clear solution with 
ammonia and barium chloride; on boiling a granular precipitate 
resulted (analysis 1). 
Ethereal chloronitride and barium acetate solution gave a prepara- 
tion from which the figures under analysis 2 were obtained. 
A precipitate from the potassium salt and neutral barium chloride 
gave the results recorded under analysis 3. 
! 
Calculated for 
(P 3 N30 fi H 3 ),Ba 3 + 
4H,0. 
Calculated for 
(P 3 N 3 K H3) 2 Ba3 + 
6H 2 0. 
Found. 
1. 
2. 
3. 
20.46 
43. 79 
P 
19.89 
43.96 
19.16 
42.35 
19.91 
41.75 
20.86 
41.91 
Ba 
1. P :Ba = 6 
2. P:Ba = 6 
3. P :Ba = 6 
2.85. Dried at 100°. 
2. 73. Dried in vacuo. 
2.91. Dried at 100°. 
The neutral salt is slightly soluble in water and easily in a solution 
of ammonium chloride; on boiling the latter it is partially reprecipi- 
tated. It also dissolves readily in a strong solution of sodium chloride, 
and, on warming, the barium sodium salt is precipitated. 
Barium sodium trimetaphosplmnate, P3N 3 6 H 3 NaBa + 1£(?)H 2 0. — 
This salt is almost insoluble in water, and forms a heavy, crystalline 
powder, which is seen under the microscope to consist of spherical 
aggregates with many rhombic facets, or occasionally of single minute 
crystals, apparently rhombohedra. The ordinary amorphous barium 
salt is invariably formed by precipitating any soluble trimetaphos- 
phimate with a barium salt in the cold, but if the chloride or other 
salts of sodium be present in sufficient quantity, this passes into the 
crystalline barium sodium salt, at once on heating, or in the cold after 
a period varying from a few minutes to several hours. The latter also 
forms at once on precipitating in hot solutions. It was also obtained by 
decomposing an ethereal solution of chloronitride (1 molecular weight) 
with a solution of barium acetate (1 molecular weight) and sodium acetate 
(9 molecular weights). As is so common with salts of barium, this tends 
to u carry down " a considerable amount of the precipitant. A prepara- 
tion made by the last method mentioned contained 0.4 ( J per cent chlorine, 
