Graduated vessels

The water passing through the condenser C was then cut off, and a stream of nitrogen substituted for the chlorine. This swept the phosphorus trichloride into D, where it was trapped. The next stage of the operation was to sweep the phosphorus trichloride from D into the graduated vessel E, the latter being cooled in liquid air while D was gently warmed. When the transference was complete, the temperature of E was allowed to rise to room temperature and the volume of phosphorus trichloride produced measured on the scale. Yield, ca. 90 per cent. 

Simple evaporation tests in conjunction with vapor pressure measurement give a further guide to composition. In these tests a liquefied petroleum gas sample is allowed to evaporate naturally from an open graduated vessel. Results are recorded on the basis of volume and temperature changes, such as the temperature recorded when 95% has evaporated or the volume left at a particular temperature (ASTM D1837). 

If it is desired to determine the yield of diazomethane by titration, the receiver should be calibrated so that the volume of the distillate can be measured without the necessity of transferring to a graduated vessel. 

Test Preparation Place 40.0 g of sample in a glass-stoppered, round-bottom flask, add 10 mL of water, and cautiously add 30 mL of 5 A potassium hydroxide. Connect a condenser to the flask, and steam-distill, collecting the distillate in a suitable 100-mL graduated vessel containing 10 mL of alcohol. Continue the distillation until the volume in the receiver reaches approximately 95 mL, and dilute the distillate to 100.0 mL with water. 

An important general rule in the quantitative handling of liquids is that the graduated vessel or pipette should be of a size appropriate to the volume being measured it is certainly not sensible to measure out a few ml of liquid in a 100 ml measuring cylinder, nor a few pi with an adjustable pipette that holds 100 pi. 

Figure 2-4. Graduated vessels. Graduated vessels are used for measuring larger volumes of liquid. For rough estimates, beakers (far left) and conical flasks (left) are suitable. For more...

At the conclusion of dialysis carefully cut off the top of the dialysis bag and transfer its contents to a graduated vessel and note its volume. The preparation may be stored frozen in this condition and is designated as supernatant VI. A 0.5 ml sample should be removed for protein and enzyme assay. 

The apparatus shown in Fig. 235 is connected to a vacuum pump. The thick-wall Pyrex ampoule a contains 10 g. of Gelg. After evacuation, 2.1 ml. (4.8 g.) of CH3I is allowed to distill from the graduated vessel b into the ampoule, which is cooled with acetone-Dry Ice mixture. The ampoule a is now sealed at the neck and heated for 24 hours at 110°C. (Caution danger of explosion, particularly at the beginning. If the ampoule is too weak.)... 

A core sample is heated in order to vaporize the oil and water, which are condensed and collected in a graduated vessel. The fluid volume divided by pore volume gives the oil and water saturation (5oii,Swater)- Gas saturation results as... 

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