Organic 2 Review Problem 506

Organic 2 Review Problem 506 - 490 P RACTICAL ORGANIC...

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490 PRACTICAL ORGANIC CHEMISTRY The rate at which bubbles of gas enter the nitrometer is now deter- mined solely by the rate at which the heating is carried out; it should be controlled so as never to exceed one bubble of gas per second. The oxidised copper spiral is carefully heated to redness by very slowly moving the burner along it, and the heating of the powder copper oxide, containing the washings from the mixing tube, is then started. Up to this point, any gas that enters the nitrometer will be carbon dioxide, and even while heating the initial portion of copper oxide, the amount of nitrogeneous material contained in it is so small that very little nitrogen will be evolved. As the burner approaches the first chalk mark, however, extra care is required as very nearly all the sample is contained in this small section of tube filling, and overheating will cause rapid combustion with a consequent rapid stream of gas bubbles in the nitrometer. The great danger here is that these bubbles contain-
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This note was uploaded on 09/19/2011 for the course CHM 2211 taught by Professor Castalleano during the Fall '06 term at University of Florida.

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