The substance was free from bases and also free from nitrogen and 

 sulfur, but it contained organically bound phosphorus. The aqueous so- 

 lution gave no precipitate with ammonium molybdate on being kept at a 

 temperature of 65 ° C. for some time but after decomposing by the 

 Neumann method it gave an immediate precipitate of ammonium phos- 

 phomolybdate with this reagent. 



The substance has no sharp melting point. When rapidly heated in 

 a capillary tube it softens at 200° C. and decomposes under effervescence 

 at 201 to 202° ; when slowly heated it begins to soften at 188° and melts 

 under decomposition at 190° to 191° (uncorrected). 



It is optically inactive. A 10 per cent, solution in a 1 dcm. tube 

 shows no rotation. 



For analysis it was dried at 100° in vacuum over phosphorus pen- 

 toxide but it did not lose in weight. 



0.1550 gram substance gave 0.0749 gram H 2 and 0.1566 gram C0 2 . 



0.0766 gram substance gave 0.0325 gram Mg 2 P 2 7 . 



Found: C = 27.55 ; H = 5.40; P= 11.82 per cent. 



For inosite monophosphate, C 6 H 13 9 P = 260. 



Calculated : C = 27.69 ; H = 5 .00 ; P = 1 1 .92 per cent. 



Titrated against barium hydroxide, using phenolphthalein as indi- 

 cator, it forms a neutral barium salt, C 6 H 1:1 9 P Ba. 



0.1985 gram substance required 7.6 cc, N/5 Ba (OH),. 



For C 8 H u O P Ba, calculated: 7.6 cc, N/5 Ba(OH) 2 . 



PROPERTIES OF INOSITE MONOPHOSPHORIC ACID. 



The acid is very soluble in water. The acqueous solution shows a 

 strong acid reaction to litmus and it has a sharp, somewhat astringent, 

 acid taste. It is insoluble in alcohol, ether and the other usual organic 

 solvents. 



Its aqueous solution gives no precipitate with barium hydroxide or 

 with calcium or barium chloride; ammonia produces no precipitate in 

 these solutions but the addition of alcohol causes white amorphous pre- 

 cipitates. Silver nitrate produces no precipitate even in a solution neu- 

 tralized with ammonia. When alcohol is added to the solution contain- 

 ing silver nitrate a white amorphous precipitate is produced which dis- 

 solves on warming; on cooling the silver salt separates in small, round 

 crystal aggregates. It gives no precipitate with ferric chloride or mer- 

 curic chloride nor with copper sulfate. In the cold no precipitate is 

 produced with copper acetate, but on warrmng this solution a bluish-white 

 precipitate separates which again dissolves completely on cooling. 



With excess of lead acetate a white, heavy amorphous precipitate 

 is formed which is but slightly soluble in dilute acetic acid, but readily 

 soluble in dilute hydrochloric or nitric acid. Ammonium molybdate pro- 

 duces no precipitate in either dilute or concentrated aqueous solutions. 



35 



