120 REPORT OF THE CHEMIST OF THE 
obtained pure after once recrystallizing. It gave the reactions 
of Scherer and Gallois and melted at 218°—219° (uncor.). 
Inosite melts at 218° (uncor.). 
Carbon and hydrogen determinations were made on the sub- 
stance dried at 110°. 
Caleulated for Inosite 
Found. CeHi206 
Ciclbsicce hi se beeper Matta sdel Mig A en Mltaatehy Sane eal ct dato 39.59 40.00 
OR a eae eee ee eee See hh ee es 6.78 6.66 
PROPERTIBS OF ANHYDRO-OXYMETHYLENE DIPHOSPHORIC ACID. 
The free acid dried slowly over sulphuric acid is a very thick, — 
transparent liquid, of a yellowish brown color. It is soluble in 
all proportions in water and alcohol, insoluble in ether, benzene, 
chloroform and glacial acetic acid. It has a very sharp acid 
taste. Heated to 110° it becomes decidedly brown without decom- 
position. The alkali salts of the acid are freely soluble in water. 
Water solutions of the free acid are precipitated by ferric chlo- 
ride, the precipitate being soluble in an excess of the reagent. 
Silver nitrate precipitates solutions of the free acid only after a 
liberal excess of the reagent has been added. The precipitate is 
insoluble in excess of the reagent. The free acid is not pre- 
cipitated by the chlorides of magnesium calcium barium or 
strontium, due to the liberation of free hydrochloric acid. How- 
ever, when solutions of the alkaline salts of the free acid are 
treated with the above re-agents, a precipitate is formed. 
The magnesium and calcium salts are somewhat soluble in 
water, the barium and strontium salts, very sparingly soluble. 
The magnesium salt is easily soluble in acetic acid. The calcium 
salt less so while the barium and strontium salts are very in- 
soluble. All are readily soluble in mineral acids. 
The free acid is tetra basic and forms two salts, the one a 
normal salt, the other an acid salt. The normal salt reacts 
neutral to phenolphthalein while the acid salt reacts neutral to 
methylorange which may be shown by the following determina- 
tions: 10 c.o. of a solution containing 0.0648 gm. of the acid 
titrated in phenolphthalein with deci-normal barium hydrate 
required 109 0. c. or 0.0748 gm. barium, 0.0648 gm. of the acid 
should require 0.0749 gm. barium to produce the normal salt 
(C. H. P. O. Ba.) 10 c.c. of the same solution titrated to 
