Mannite solution

Dulcite is obtained from Madagascar manna by extraction with water and recrystallizing, large monoclinic prisms, m.p. 188°, less soluble than mannite. It may also be procured by the action of sodium amalgam on aqueous solutions of lactose and of d-galactose. Nitrodulcite, isomeric with nitromannite, crystallizes from alcohol in needles which melt at 94-95°. 

Ri and R% were tubes of an electrolyte consisting of a solution which is molar with respect to both mannite and boric acid. This has been found by Magnanini 4 to have a very low temperature coefficient of conductance. The liquid whose dielectric constant was desired was placed in a vessel of the type shown in Fig. 3. The metal shell, B, and the metal plate, A, held apart by the insulating cap, /, form the condenser Cg, of Fig. 2. The bridge was balanced by adjusting the distance between the plates of an air condenser, C4, consisting of two sheets of brass, insulated from each other, which could be set at accurately known distances apart Since most liquids and solutions have at least a slight electrolytic conductance, an adjustable electrolytic resistance, was... 

Solubility of Phenyl Thio Urea in Aqueous Solutions op Acetone, Mannite, Cane Sugar, Dextrose, and Urea. 

Calcium Hydioxid—Slacked lime—Calcis hydras (Br.)—CaHsOa-—74—is formed by the action of HaO on CaO. If the quantity of HaO used be one-third that of the oxid, the hydroxid remains as a dry, white, odorless powder alkaline in taste and reaction more soluble in cold than in hot HaO. If the quantity of HaO be greater, a creamy, or milky liquid remains, cream or milk of lime a solution holding an excess in suspension. With a sufficient quantity of HaO the hydroxid is dissolved to a clear solution, which is lime water—liquor calcis (TI. S. Br.). The solubility-of CaHaOa is diminished by the presence of alkalies, and is increased by sugar or mannite liq. calc, saccharatus (Br.). Solutions of CaHaOa absorb COa with formation of a white deposit of CaCOa. 

Procedure. A drop of the slightly acid germanate solution is mixed with a drop of phenolphthalein solution, and 0.01 N sodium hydroxide is added until the red color appears. On the addition of mannite (solid) the red color is partly or completely discharged. 

Fig. 6.18 SEM picture of structures close to the surface of a 2 mm particle formed from a 10wt% solution of mannite in water. The solution was dripped into a bath of liquid nitrogen, suddenly frozen and dried afterwards...

The poK hydroxy-alcohoIs with four and six hydroxyl gi oups react with benzaldehyde in hydrochloric acid solution to j ield sparingly soluble benzal derivatives, but, imfortunatelj, such derivatives, as for example, those of erythrite. mannite, dulcitc, and sorbite, all melt in the neighborhood of 200 -220°,... 

Meier et al. (20) studied this method very thoroughly zirconium is dissolved without warming up in a mixture of sulphuric and hydrofluoric acid under addition of a small amount of mannite to avoid losses of boron. The solution is then oxidized with some hydrogen peroxide and allowed to stand for 12 hours to decompose the excess of hydrogen peroxide. The further procedure is the one described in detail for the determination of boron in aluminium, except that here a pH value of 1.2 has to be used and the extraction is carried out in the presence of some hexamethylenetetramine. 

An etched 0.5 g aluminium sample is spiked with a standard solution of boron enriched in B (1.202 10 at.B/g B = 88.06 at.%), and dissolved in 2 ml concentrated nitric acid (suprapur) at 70 C under addition of 1 ml hydrochloric acid (suprapur) every 10 to 15 minutes in order to prevent excessive foaming. After addition of 6 ml hydrochloric acid a clear solution is obtained. To this solution 10 g methanol (purified by distillation over a mixture of sodium hydroxide and mannite) is added, and boron is distilled at 95°C in the form of trimethyl borate. After dilution to 20 ml with water and addition of 2 Mg mannite, the solution is evaporated down to 0.5-1 ml at 60°C. 

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