Measuring cylinder

A i-litre measuring cylinder may be used in place of the cylinder E, but when the bung F is in position, any gap at the lip of the cylinder must be tightly plugged with cotton wool. 

Mix 100 g. of maleic acid (Section 111,143) and 100 ml. of tetra chloroethane in a 250 ml. Claisen or distilling flask provided with a thermometer, and attach a Pyrex Liebig condenser. Heat the flask in an air bath (Fig. 11, 5, 3) and collect the distillate in a measuring cylinder. When the temperature reaches 160°, 76 ml. of tetrachloroethane and 15-15-5 ml. of water are present in the receiver. Empty the water in the condenser and continue the distillation change the receiver when the temperature reaches 190°. Collect the maleic anhydride at 195-197°. Recrystallise the crude anhydride from chloroform. The yield of pure maleic anhydride, m.p. 54°, is 70 g. 

For reagent solutions as defined above (i.e. 1) it is usually sufficient to weigh out approximately the amount of material required, using a watchglass or a plastic weighing container, and then to add this to the required volume of solvent which has been measured with a measuring cylinder. 

Mix 400 mL of pure concentrated hydrochloric acid with 250-400 mL of distilled water so that the specific gravity of the resultant acid is 1.10 (test with a hydrometer). Insert a thermometer in the neck of a 1 L Pyrex distillation flask so that the bulb is just opposite the side tube, and attach a condenser to the side tube use an all-glass apparatus. Place 500 mL of the diluted acid in the flask, distil the liquid at a rate of about 3-4 mL min-1 and collect the distillate in a small Pyrex flask. From time to time pour the distillate into a 500 mL measuring cylinder. When 375 mL has been collected in the measuring cylinder, collect a further 50 mL in the small Pyrex flask watch the thermometer to see that the temperature remains constant. Remove the receiver and stopper it this contains the pure constant boiling point acid. Note the barometric pressure to the nearest millimetre at intervals during the distillation and take the mean value. Interpolate the concentration of the acid from Table 10.5. 

Measure out 9 mL of pure concentrated hydrochloric acid by means of a burette, pour the acid into a 1 L measuring cylinder containing about 500 mL of distilled water. Make up to the litre mark with distilled water and thoroughly mix by shaking. This will give a solution that is approximately 0.1M. 

Hydrochloric acid, concentrated. Also a solution prepared by measuring 50 mL (measuring cylinder) of the concentrated acid into a 1 L graduated flask and making up with de-ionised water. 

Manganese, D. of - continued with magnesium and zinc, (ti) 334 Mannitol 299, 581 Masking agents 12, 312 Mass action law 16 applications to electrolyte solutions, 23 Matrix effects 733, 794 Maxima in polarography 597 suppression of, 597, 611 Mean deviation 134 relative, 134 standard, 134 Measuring cylinders, 87 flasks, 81... 

A variable-area, fluid or gas flow-rate meter. Usually a cone inside a glass measuring cylinder that is suspended by the upward flow of gas or liquid. 

FIGURE 14.10 The two measuring cylinders contain the same mass of liquid. The cylinder on the left holds about 10 mL of water, that on the right liquid hydrogen, which is one-tenth as dense and consequently has a volume of about 100 mL. 

Dipping solution Immediately before use mix 10 ml water, 8 ml solution I, 2 ml solution II and 1 ml 32% hydrochloric acid in a measuring cylinder and make up to 100 ml with methanol [2]. 

The traditional arrangement of simple spherical glassware and Isomantles with full-power on-off controllers monitored by mercury thermometers, would still be widely recognised. So too would be the plug-shot piston pumps set up and monitored by use of measuring cylinders. Although tried and tested this hardware system requires constant attention by a skilled lab. technician to achieve control and reproducibility of even the first-order process parameters manual data collection is hardly feasible at better than 10-15 minute intervals. 

Traditional Apparatus. As indicated earlier, liquid delivery systems for controlled rate addition of monomers and initiators have tended to rely upon constant speed piston pumps (19) in which volumetric control is achieved by manual adjustment of stroke length, and monitoring is by discharge from measuring cylinders. 

For animal matrices, homogenize 10 g of a prepared sample with acetonitrile (50mL) for 5min and centrifuge the mixture at 3000rpm for 3 min. Decant the supernatant extract into a measuring cylinder (100-mL) and adjust the volume of the extract to a known value. 

Reaction with methanol may be vigorously exothermic. A mixture of bromine (9 ml) and methanol (15 ml) boiled in 2 m and in a previous incident such a mixture had erupted from a measuring cylinder [1], The exotherm with industrial methylated spirits (ethanol containing 5% methanol) is much greater, and addition of 10 ml of bromine to 40 ml of IMS rapidly causes violent boiling [2], A further case of ejection of a methanol solution of bromine from a measuring cylinder was described [3],... 

A dropper is calibrated by counting the number of drops required to transfer 2 mL of the intended liquid from its original container to a 5-mL measuring cylinder. For example, if it takes 40 drops to measure 2 mL of a liquid, then the number of drops to measure 0.15 mL of the liquid is obtained by the method of proportion as follows ... 

A pharmacist measured 50 mL of syrup USP in a measuring cylinder, and transferred that amount to a beaker. To his surprise, he later observed that 5 mL of syrup USP was still left in the cylinder. What is the percent error in his syrup USP measurement ... 

How would you measure 0.025 mL of a concentrate which is to be diluted to 60 mL following the measurement You are provided with a 5 mL pipet with marking in units of 1 mL, a measuring cylinder, and a container to dispense the final product. 

---