Organic 2 Review Problem 489

Organic 2 Review Problem 489 - QUANTITATIVE ANALYSIS 473...

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QUANTITATIVE ANALYSIS 473 copper wire. These elements of tube-filling will be heated, not by the furnace but by the thermostatic mortar which is maintained at 180°. The main purpose of the lead peroxide is to absorb any oxides of nitrogen produced in the com- bustion of nitrogen-containing substances. It is maintained at 180°, which is about its optimum temperature for this purpose. Lead peroxide also absorbs appreciable quantities of water at this temperature but it is allowed to absorb its complement before an actual determination is carried out in the tube. When an actual combustion is then carried out there is a smooth exchange of water through the lead peroxide, provided the temperature of the mortar is kept constant, and the theoretical amount of water vapour emerges from the com- bustion tube and is absorbed in the absorption tube. Lead peroxide also absorbs some CO 2 but this is at a minimum around 180° and again it is allowed to absorb its complement before an actual determination is carried out. The
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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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