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By Nicholas Dimitrius Cheronis

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3 g. The use of most activated carbons has the disadvantage of carbon passing through the common filter paper. If filter Fig. 6. Macro apparatus for ordinary filtration paper with very small openings is used, the filtration will be too slow and crystallization will start while the solution is being filtered. The use of a small amount of Super-eel3 or asbestos fiber, if added before filtration, gives clear filtrates. If the solvent is inflammable, care must be taken to see that no flames are in the vicinity.

The amount of carbon to be added depends on the amount of colored impurities present; about 1 to 3 per cent of the amount of the crude solid may be taken as an average. 3 g. The use of most activated carbons has the disadvantage of carbon passing through the common filter paper. If filter Fig. 6. Macro apparatus for ordinary filtration paper with very small openings is used, the filtration will be too slow and crystallization will start while the solution is being filtered. The use of a small amount of Super-eel3 or asbestos fiber, if added before filtration, gives clear filtrates.

At 80° the vapor pressures of both liquid and solid are the same. The rate of transformation of solid naphthalene to liquid at 80° equals the rate of transformation of liquid naphthalene to solid. Below 80° the transformation of liquid naphthalene to solid proceeds faster than that from the solid to liquid, and the substance solidifies. Above 80° the vapor pressure 41 42 EXPERIMENT 3 of the solid is higher than that of the liquid; hence the rate of transformation of solid to liquid naphthalene is greater than from, the liquid to the solid, and consequently the substance liquefies.

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Semimicro and macro organic chemistry;: A laboratory manual by Nicholas Dimitrius Cheronis


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