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Dextrins are white, yellow, or brown powders that are partially or fully water-soluble, yielding optically active solutions of low viscosity. Most of them can be detected with iodine solution , giving a red coloration; one distinguishes erythrodextrin (dextrin that colours red) and achrodextrin (giving no colour).
Chemical pulping involves dissolving lignin in order to extract the cellulose from the wood fiber. The different processes of chemical pulping include the Kraft process, which uses caustic soda and sodium sulfide and is the most common; alternatively, the use of sulfurous acid is known as the sulfite process, the neutral sulfite semichemical is treated as a third process separate from sulfite ...
The following chart shows the solubility of various ionic compounds in water at 1 atm pressure and room temperature (approx. 25 °C, 298.15 K). "Soluble" means the ionic compound doesn't precipitate, while "slightly soluble" and "insoluble" mean that a solid will precipitate; "slightly soluble" compounds like calcium sulfate may require heat to precipitate.
CH 3 CH 2 CH 2 COOH: butyric acid: 107-92-6 HN(CH 2 CH 2 OH) 2: diethanolamine: 111-42-2 HN(CH 2 CH 2 NH 2) 2: diethylenetriamine: 111-40-0 C 4 H 10 O 2: dimethoxyethane: 110-71-4 (CH 3) 2 NC(O)H: dimethylformamide: 68-12-2 C 2 H 8 N 2: 1,1-dimethylhydrazine: 57-14-7 C 2 H 8 N 2: 1,2-dimethylhydrazine: 540-73-8 (CH 3) 2 SO: dimethyl sulfoxide ...
According to their properties, cations are usually classified into six groups. [1] Each group has a common reagent which can be used to separate them from the solution.To obtain meaningful results, the separation must be done in the sequence specified below, as some ions of an earlier group may also react with the reagent of a later group, causing ambiguity as to which ions are present.
The third and last step (called SC-2) is performed with a solution of (ratios may vary) [2] 6 parts of deionized water; 1 part of aqueous HCl (hydrochloric acid, 37% by weight) 1 part of aqueous H 2 O 2 (hydrogen peroxide, 30%) at 75 or 80 °C, typically for 10 minutes. This treatment effectively removes the remaining traces of metallic (ionic ...
logX m = ƒ 1 logX 1 + ƒ 2 logX 2. Where X m is the mole fraction solubility of the solute, X 1 and X 2 denote the mole fraction solubility in neat cosolvent and water. While this model is only correlative in nature, further analysis allows for the creation of a predictive element. Simplifying the above equation to: logX m = logX 2 + σ • ƒ 1
β-Cyclodextrin exists as a white (colorless) powder or crystals. The density of its saturated hydrate crystal (βCD·12H 2 O) is 1.46 g/cm 3 . β-Cyclodextrin is moderately soluble in water and glycerin ; well soluble in dimethyl sulfoxide , dimethylformamide , pyridine , HFIP , and ethylene glycol ; and insoluble in ethanol and acetone .