Methods of Analysis: 1,
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Phase solubility analysis is a technique for quantitatively determining the purity of a substance through the application of precise solubility measurements. At a given temperature,
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2012 Nike Free Run 3.0 Bleu Noir Femmes Cadeau Pour Vous Ou Votre Famille, a definite amount of a pure substance is soluble in a definite quantity of solvent. The resulting solution is saturated in respect of the particular substance,
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Nike Roshe Run Hombres Gris Volt Para Hombres Baratos Running Zapatos, but the solution remains unsaturated in respect of other substances even though such substances may be closely related in chemical structure and physical properties to the particular substance being tested. Constancy of solubility indicates that a material is pure or free from foreign substances except in the unique case where the percentage composition of the material being tested is in direct ratio to the solubilities of the respective components. Conversely,
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The standard solubility method consists of several distinct steps: (a) preparation of a series of separate systems composed of increasing quantities of material and measured,
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The following criteria are used in the selection of a proper solvent for phase solubility analysis:

(1) The solvent should be of such volatility that it can be evaporated under vacuum,
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(2) The solvent should not adversely affect the substance,
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(3) The solvent should be of known purity and composition,
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(4) For the method described below the test substance should be soluble to the extent of not less than 4 mg/g and not more than 50 mg/g in the solvent chosen,
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Constant temperature bath. For these tests use a constant temperature bath capable of maintaining a preselected temperature within 0.1 C. Normally temperatures of 25 C or 30 C are selected. The bath should be equipped with a horizontal shaft capable of rotating at approximately 25 revolutions per minute,
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Ampoules,
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FIG,
Nike Roshe Run Fb Yeezy Azul Hombres Amarillo Entrega Rápida a Su Puerta,
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2012 Nike Free Run 5.0 V3 Negro Plata Mujeres Más De 60% De Descuento. AMPOULE (LEFT) AND SOLUBILITY FLASK (RIGHT)

USED IN PHASE SOLUBILITY ANALYSIS

Solubility flasks,
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Men Nike Free Run 2 Blue White Yellow Quilted Is a Good Choice For You. A suitable flask (with stopper) is shown in Fig,
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Balance,
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The method described below is generally applicable. However,
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Weigh accurately not less than 7 marked,
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2012 Nike Free Run 2.0 Gris Púrpura Mujeres Outlet Tienda Online 2014, ampoules and into each of them weigh,
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2014 Nike Free Run Gimnasio Blanco Negro Hombres Con Calidad Superior, increasingly larger amounts of the test substance. The weight of the test substance is selected so that the first ampoule contains slightly less material than will go into solution in 5 mL of the selected solvent,
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2012 Nike Free Run 3 Gris Naranja Mujeres Bueno Guality Y Media Precio, W2 is the weight of the ampoule plus test substance,
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The time required for equilibration varies with the substance,
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In order to demonstrate that a state of equilibrium has been attained,
Nike Roshe Run Black Men solaire Rouge Nouvelle Collection Est Disponible, the following procedure is frequently applicable: Bring about a supersaturated solution in one of the ampoules the next to the last in the series by warming it to a temperature about 10 C above that of the constant temperature bath,
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528896 101 Air Jordan 11 Low White Varsity Red Outlet Online Store 2014, failure of the solubility value from the "supersaturated" ampoule to fall in line with the other solubility values does not necessarily prove that the other ampoules have not attained equilibrium,
Nike Free Run 2 2, since it can occasionally be due to the tendency of certain materials to remain in supersaturated solution. To attain equilibrium in such cases,
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After equilibration,
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Prepare a graphical representation of the results for each portion of the test substance taken by plotting the ratio of the weight of the dissolved materials per weight of solvent (Y axis or solution composition) against the ratio of the total weight of material per weight of solvent (X axis or system composition). As shown in Fig. 3,
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FIG,
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The point B in the diagram represents the system where the main component or,
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At point C in the diagram the next component of the test substance has reached the limit of its solubility,
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Between points D and E in the diagram the solution is saturated in respect of all components in the test substance,
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Under appropriate conditions the number of impurities present in the test substance is shown by the number of inflexions of the solubility curve above the first saturation point (B) and the solubilities of the respective components can be obtained in a way similar to that described above,
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