Drying ovens for

FIGURE 3.6 A weighing bottle with sample, lid ajar, in small beaker, ready to be placed in a drying oven for the purpose of drying the contained sample. 

For this experiment you will need a minimum of 3 to 4 g of primary standard potassium hydrogen phthalate (KHP) for three titrations. Place at least 6 g of it in a weighing bottle and dry in a drying oven for 2 h. Your instructor may choose to dispense this to you. 

After 20 min, turn off the power. Remove the cathode and rinse it very gently with deionized water. Place the cathode in a drying oven for 20 min. Alternatively, rinse the cathode gently with acetone, and let the acetone evaporate in the fume hood for 5 min. 

Some Foldur kraft samples were preaged before borohydride treatment and further aging. Paper samples were subjected to accelerated aging at 100 °C in a dry oven for 14 h or at 90 °C and 50% rh for 7 h. 

Carefully remove the filter paper from the funnel, and place it on the paper towel that you have labeled with your name. Unfold the filter paper, and place the paper towel, filter paper, and precipitate in the rinsed beaker. Then place the beaker in the drying oven. For best results, allow the precipitate to dry overnight. 

The first system involved a polymer laminate of polyethylene (PF) (25 pm) and polycarbonate (PC) (3 pm) films (both from Bayer AG, Germany). A portion of PC film ( lcm ) was positioned on top of a 2cm PF film, and the two were sandwiched between two aluminum foils, heated to 150 °C in a drying oven for 1 h and then compressed (10 bar pressure). The sample was then imaged at the sharp borderline of the PF/PC laminate and the single PE layer in the ATR mode (50 X 50pm ) and in transmission (260 x 260pm ). 

The glassware in this reaction is dried with a heat gun and placed in a drying oven for 1 hr prior to use. 

Place the moist plates on glass plates and place them in the drying oven for a few minutes. 

Very pure CuO (15 g.) is dissolved in a clear, carbonate-free solution of 500 g. of NaOH in 330 ml. of HsO (brief refluxing). The dark-blue solution is cooled to 110 C and carefully diluted by adding 140 ml. of H3O through the reflux condenser (use a funnel). The small quantity of unreacted CuO is then filtered off, collecting the filtrate in a preheated Erlenmeyer flask of refined silver. The Erlenmeyer flask is protected by a Peligot tube (filled with 50% KOH) and kept in an electric drying oven for six days at TO C to allow the filtrate to crystallize. The mixture is then filtered the crystals are washed with some 50% and 45% sodium hydroxide (once each) at room temperature and dried on a clay plate over H3SO4. Yield 13 g. 

In applications where profiling (fingerprinting) is more important than any form of quantification, powdered materials can be mixed into a paste with water or a suitable solvent. The paste can then be smeared onto the foil or ribbon, and the water/solvent evaporated in a drying oven for Curie-point foils, or by using the dry function for filaments. 

Carefully cover the evaporation residue with 2 g magnesium nitrate Dry at 180 °C in a drying oven for 20 minutes... 

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