Desiccants definition

For purification, the product is dissolved in 800 cc. of 1 N sodium hydroxide, 500 cc. of ethyl alcohol is added, and the solution is filtered. The filtrate is transferred to a 2-1. beaker and is heated to the boiling point. Then 160 cc. of 5 A hydrochloric add is slowly added, through a dropping funnel, while stirring by hand. The mixture is cooled to room temperature and is filtered with suction. The product is washed with 100 cc. of ethyl alcohol, then with 200 cc. of water, and is dried in a vacuum desiccator over phosphorus pentoxide. The nearly white, lustrous platelets have no definite melting point (Note 5). The yield of pure amino acid is 98-112 g. (33-37 per cent of the theoretical amount) (Note 6). 

It is probably not a definite hydrate. It loses water when kept in a desiccator, yielding a substance corresponding in composition to the monohydrate, Fe203.H20, but which is not very stable, and is probably not the normal monohydrate. 

The desiccation via air-drying definitively stabilized the P pool, especially in the C-Al-pp model for this sample, the P/ and Pm where about 2 or 3% of Pa, respectively, while the P/ of C-Fe-pp represented about the 20% of Pa (please, note that P caimot be estimated for C-Fe-PP)-... 

Filter the crystalline product on the Buchner funnel with the suction and drain thoroughly. The yield of the sufficiently pure product is almost near to the theoretical yield. It may he dried with diying-paper or in a CaCl2—desiccator or in a vacuum (i.e., reduced pressure). The 3neld of the product is approximately 5.5 g which does not exhibit any definite mp. 

Filter, drain and dry over CaClg in a desiccator. The yield of the product is 6.3 g having no definite mp. 

The n-hexane in the platinum dish or glass dish is vaporized off on the water bath at a maximum of 80 C. Then the dish with the extractable substances is dried at 80 C in the drying cabinet and is then weighed out on a semimicro balance after a definite cooling time in a desiccator. The precautions usual when working in the semimicro range are to be observed. 

Room temperature switching times, per the standard literature definition (1), were ca. 30 s for the space devices and < 2 s for the terrestrial devices, the longer times for the former being due to the more desiccated state of the solid electrolyte in them. At -35 C switching times were ca. 20 minutes. Cyclabilities (1), were > lO" cycles for all devices. 

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