Funnels: filter

In a 500-cc. three-neck, round-bottom flask provided with a mechanical stirrer is placed 106 g. (1 mole) of benzaldehyde (Note 1), and 93 g. (r mole) of aniline is added with rapid stirring. After a few seconds a reaction occurs with evolution of heat and separation of water. The mixture is allowed to stand fifteen minutes and is then poured, with vigorous stirring, into 165 cc. of 95 per cent alcohol in a 600-cc. beaker. Crystallization begins in about five minutes, and the mixture is allowed to stand, first ten minutes at room temperature, and then thirty minutes in ice water. The almost solid mass is next transferred to a large Buchner funnel, filtered by suction, pressed out, and air dried. The yield of pure benzalaniline melting at 520 is 152-158 g. (84-87 per cent of the theoretical amount). 

Round-bottom flask, 50-, 250- and 500-mL Food chopper Buchner funnel, 10-cm Funnel, filter, 10-cm... 

Weigh 20 g of the plant sample into an Erlenmeyer flask and add 40 mL of 1 N HCl and 160 mL of acetonitrile. Shake the flask for 30 min at 300 strokes min using a shaker. Filter the aqueous acetonitrile extract through a No. 4 Kiriyama funnel filter paper. Wash the residue on the filter with 100 mL of acetonitrile. Combine the filtrates and remove acetonitrile with a rotary evaporator. Transfer the residue with 20 mL of saturated aqueous sodium chloride solution into a separatory funnel, extract the solution with 3 x 30 mL of n-hexane-ethyl acetate (9 1, v/v), and collect the organic phase in a flask. Dry with anhydrous sodium sulfate and remove the combined organic phase with a rotary evaporator. Transfer the residue into the Eppendorf tube with a... 

Concentrate the extracts to about 40 mL at 60 °C under reduced pressure in a rotary evaporator. Transfer the concentrate into a 250-niL separatory funnel, rinse the evaporation flask with 100 mL of aqueous 10% sodium chloride solution and then with 50 irL of dichloromethane, and add the rinsates to the separatory funnel. After shaking the separatory funnel, filter the lower organic phase over anhydrous sodium sulfate into a 250-mL evaporation flask. Repeat partitioning with a second portion of 50 irL of dichloromethane and combine the organic phases. Evaporate the solvent with a rotary evaporator at 40 °C. 

Almond (200 g) apricot kernel (200 g) peach kernel (200 g) apple seed (100 g) distilled water (1000 mL) ethyl acetate (1000 mL) acetone (500 mL) homogenizer one 100 mL Buchi funnel filter paper. 

Pour the contents of the flask into a Buchner funnel and rinse the flask with 300 ml of anhydrous ethyl ether. Pour this into the funnel. Filter with vacuum from an aspirator equipped with a dry ice/acetone trap. Wash the filter cake with two 300ml portions of anhydrous ethyl ether. The filter cake is X, n-diethyaniline hydrochloride and is not used in this process. It may be saved and converted back to its original form for reuse. 

One lOmL Schlenk mbe equipped with a magnetic stirrer bar One 100 mL round-bottomed flask Magnetic stirrer plate One 100 mL Erlenmeyer flask One funnel Filter paper... 

Mortar pestle 100 ml beaker evaporating dish funnel filter paper tongs three small test tubes Bunsen burner or candle matches pea-size amount 2CuC03 Cu(OH)2 (azurite) other soft minerals such as talc gypsum or calcite 9.2 g C0(N03)2 (cobalt II nitrate) 5.3 g Na2C03 (sodium carbonate) 100.0 ml graduated cylinder distilled water centigram balance four small test tubes small spatula wash bottle two 250 ml beakers. 

Large funnel filter paper two 1 L beakers five 250 ml beakers 1 L graduated cylinder distilled water red and blue litmus paper 21.2 g Na2C03 (sodium carbonate) 22.2 g CaCl2 (calcium chloride) 10.0 g CaO (calcium oxide) stirring rod two watch glasses distilled water wash bottle. 

Gather these materials Powdered potassium aluminum sulfate (A12(S04)3. K2S04) a small amount of clay some sand 2 funnels filter paper an upright stand and 2 ring supports and 4 pint jars. 

Gather these materials An alcohol burner pound of spinach 1 small beet grain alcohol a pot 3 test tubes a fork 2 funnels filter paper a glass rod and 4 glass jars, 3 of them very small. (Get your mother s permission to use the stove.)... 

Melt solid fats and filter, using a heated funnel filter oils that are not clear and make determinations on these homogeneous samples. Store in a cool place protected from light and air. 

The reaction mixture described above i.s cooled to 25° and carbonated by adding freshly crushed Dry Ice. The temperature falls rapidly when carbonation is complete. Ethanol (100 ml.) is added dropwisc (and cautiously) to destroy unreacted sodium after which 350 ml. of distilled water is added, also cautiously. The aqueous solution is separated in a separatory funnel, filtered and acidulated with 230 ml. of concentrated hydrochloric acid. The gray crystalline solid, 150 g., is filtered off, taken up in hot water, treated with decolorizing charcoal, filtered, and allowed to recrystallize as long white needles, m.p. 153-153.5°. Tins acid is not very soluble in hot water and is u.sually recrystallized batchwise from 2500 ml. of water in a 4-liter beaker. The mother liquor is recycled. 

A) Filtration on the Buchner Funnel. The Biichner funnel is used for large-scale filtrations. If the quantity of material is small (<2 g), the Hirsch funnel can be used. Properly matched Buchner funnels, filter paper, and flasks are shown in Fig. 6. The Hirsch funnel shown in the figure is an old-style porcelain type. 

The presence of moisture in the oils makes them cloudy and detracts from their appearance. Moisture, if not removed, will hasten chemical changes in the oils, especially in the presence of air. This may appreciably affect their value. It is desirable therefore that the oils be dried as soon as possible by filtering through filter paper in an ordinary funnel. Filter paper for this purpose may usually be purchased in drug stores. Large quantities are usually filtered through chamois. 

Al-Razi described much other equipment that would be familiar to any student of chemistry beakers, flasks, crystallizing dishes, spatulas, funnels, filters made of cloth, and pestles and mortars. His shelves contained not only all the known metals, but also many other substances such as pyrites, malachite, lapis lazuli, gypsum, hematite, galena, turquoise, stibnite, alum, green vitriol, natron, borax, salt, lime, potash, cinnabar, white and red lead, iron oxide, copper oxide, vinegar, and probably caustic soda, glycerol, and sulfuric and nitric acids. 

Material Crystallizing bowl, 2 beakers, funnel, filter paper, glass rod, thread alum salt (KA1 (S04)2 x 12 H20). 

Flask, volumetric, 100 mL Funnel, filter, 60 ", long stem Goggles, safety Holder, buret Holders, clamp Hot plate... 

Step 4. Place the thumb of the hand holding the filter flask over the Hirsch funnel filter bed to shut off the air flow through the system (see Fig. 5.39). This win result in an immediate drop in pressure. The volatile solvent wiU rapidly come to a boil at room temperature. Thumb pressure adjusts air leakage through the Hirsch funnel and thereby controls the pressure in the system. It is also good practice to learn to manipulate the pressure so that the liqiiid does not foam up into the side arm of the filter flask. 

Paraffin (histological grade, melting point 54-56°C) is melted beforehand in the oven and funnel-filtered through Whatman No 1 paper. It can then be stored melted in the oven. 

Watch and clock glasses, crucibles, dishes, funnels, filtering equipment... 

A 100 mb two-necked round flask, dropping funnel, Dimroth condenser, oil bath, separating funnel, filter funnel, magnetic stirrer, safety glasses, laboratory coat, and protective gloves. 

The patch test method of monitoring the degree of particulate contamination in liquids is undertaken by observing the discoloration of the surface of a 5 pm filter membrane, through which a standard volume of liquid has passed. PVC bottles (120 ml) are used to collect the sample, and this is then processed via a stainless steel funnel filter holder and flask under vacuum. Care is needed in processing as rinsing solvents must themselves be filtered to avoid cross-contamination. Care is also needed to prepare the equipment for re-use. 

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