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<921> WATER DETERMINATION 很多药典物品要么是水合物，要么含有处于吸附状态的水。因此，测定水分含量对于证实与药典标准的符合性是很重要的。通常，在各论中会根据该物品的性质，要求使用下面若干方法中的一个。偶尔，会允许在2个方法中任选一个。当该物品含有水合状态的水，按照具体各论中的规定，使用方法I（滴定...
(Kf for water is 1.858 C/m.) Freezing Point Depression Freezing point depression is a phenomenon wherein the freezing point of a solvent decreases in the presence of a solute. It is one of the colligative properties. The magnitude of the temperat...
In this stage, the concentrations in regions i and j are approximately equal. The molecules are updated based on the optimal position within each region to achieve an equilibrium state. The update formula is given by Eq. (18): $$X_{{p,g}}^{{t+1}}=X_{{EO,p}}^{t}+Q_{{EO,g...
isazoverbindungen, according to the general formula (1). in which d, the benzene or naphthalinkern means, by one or two substituents from the group of fluorine, chlorine, bromine, alkyl, carboxy, lower level.less alkoxy and nitro, and / or one, two, or three sulfogruppen can be ...
where Kf (mg L−1) and N are the Freundlich isotherm model's coefficients for the adsorption removal and strength coefficients, respectively, the infinite surface coverage that is anticipated mathematically indicates multilayer adsorption on the surface since the Freundlich model does not expect the ...
Water(KF) NMT 0.2% Sulphated Ash NMT 0.1% Heavy Metals NMT 10ppm Lead(Pb) Cadmium(Cd) Arsenic(As) NMT 0.5ppm NMT0.5ppm NMT1.0ppm Assay 98.0-103.0% Residual Solvents Methanol NMT 3000ppm n-Hexane NMT 290ppm Ethanol NMT 5000ppm
. Sodium tartrate may be used as a convenient water reference substance. Quickly add 75 to 125 mg of sodium tartrate (C4H4Na2O6·2H2O), accurately weighed by difference, and titrate to the endpoint. The water equivalence factorF,in mg of water per mL of reagent, is given by the formula...
In most cases, the minimum amount of specimen, in mg, can be estimated using the formula: FCV/KF in which F is the water equivalency factor of the Reagent, in mg per mL; C is the used volume, in percent, of the capacity of the buret; V is the buret volume, in mL; and KF is...
Calculate the boiling point of a solution of 500.0 g of ethylene glycol (C2H6O2) dissolved in 500.0 g of water. Kf = 1.86 C/m and Kb = 0.512 C/m. Use 100 C as the boiling point of water. An aqueous s...