Plastic funnel

Teflon stir bar 1 heavy duty balloon 1 roll of electrical tape Magnetic stirrer Support stand and clamps Ohaus triple beam scale 1 plastic funnel... 

Place a glass or plastic funnel over the top of a 100-ml volumetric flask and line the funnel with Whatman no. 1 filter paper. Prewet the filter paper with 1 1 TCA reagent/water. 

Once the sample has been homogenized, carefully transfer the sample into the Kraft bags using a clean plastic funnel. 

The goal of vacuum filtration is usually to remove liquids from a solid to obtain a solid that is dry. An aspirator or a vacuum pump is used to provide suction though a rubber tube to a filter trap. The trap is attached to a filter flask (show to the right) by a second rubber tube. The filter flask is an Erlenmeyer flask with a thick wall and a hose barb for the vacuum tube. Filter flasks are used to filter material using a Buchner funnel (shown to the right) or a smaller Hirsch funnel. These porcelain or plastic funnels hold a circular piece of filter paper. A single-hole rubber stopper supports the funnel in the flask while maintaining suction. 

Plastic funnel Rubber gloves Sample bags To be used to help pour sample into sample bag To be used to help rub sediment through sieve mesh Kraft strong paper 4" X 8" (10 X 20 cm) sample bag stuck with waterproof glue. Paper allows sediment to dry. 

Sampler 1 downstream of the water sampling will wash the trenching tool (shovel), sieve nest, both pans, the plastic funnel and both sets of thick black protective rubber gloves with stream water. The sieve nest (Fig. 4.5) is assembled on the top of the glass-fibre pan, in a stable position, as close to the sediment collection point as possible. The collection pan and sieves must be clean and free from any particulate matter before the commencement of sampling. 

Diphenyl Tellurium Difluoride1 in a plastic beaker 1.39 g (4.7 mmol) of diphenyl tellurium oxide are dissolved in 500 m/ of water kept at 60°. The solution is cooled to 20°, 40% hydrofluoric acid is added dropwise to the stirred solution until a pH of 1 - 2 is reached, and the mixture is stirred for a further 20 min. The precipitate is filtered using a plastic funnel, the filter cake is pressed between thick layers of filter paper, the product is dried in a vacuum dessicator, and than recrystallized from methanol yield 0.9 g (60%) m.p. 153°. 

Small-scale field trials with fully stabilised micro-encapsulated formulations were carried out in Egypt during 1980 on two cotton pests - pink bollworm, Peotinophora gossypiella, and the Egyptian cotton leafworm, Spodoptera littoralis. Plots of 10 n x 10m were sprayed with the formulation and there were three replicates of each treatment. A plastic funnel trap (3) baited with synthetic pheromone was positioned at the centre of each plot. The effectiveness and persistence of communication disruption were measured by the reduction in catches of male moths in the traps in the treated plots relative to the catches in similar traps in untreated, control plots. 

After 24-36 hours, bronze crystals fill the bottom of the beaker. They are filtered (plastic funnel), washed with two 2-mL portions of ice cold water and allowed to dry in air. Yield 0.80-050 g (78-88%), based on Cs2 [Pt(CN)4] H20. For analyses see Table I. 

To complete the wash bottle you ll need a plastic funnel, rubber tubing glass tubing... 

Plastic funnels of nearly any size can be bought at your supermarket, 3ut you can also... 

How We Are Finding Out about the Unknowns list (from Lesson 3) 1 plastic funnel... 

Initially, 1.60 g [C(NH2)3] 2 [Pt(CN)4] rxr O is dissolved in 5 mL concentrated HF (28.9 M) in a 50-mL polyethylene beaker. The solution is transferred to an electrolysis cell which is constructed from a polyethylene beaker with two holes drilled 2 cm beneath the top of the solution. Two platinum wires 25 mm long are cemented in the two holes with epoxy cement and separated by 5 mm to form the electrodes. A constant potential is applied to the electrodes using a 1.5-V dc source.10 Crystal growth is observed anytime between 1 and 5 days. One week after initial crystal formation, the crystals are suction filtered through a plastic funnel using Whatman qualitative filter paper. The material is then washed with two 5-mL portions of cold water and allowed to air dry. The yield is 1.46 g (80%) based on [C(NH2)3] 2 [Pt(CN)4] xH20 being anhydrous. 

After 2 hours of electrolysis10 at 1.5 V, the product, having filled the bottom of the beaker, is filtered in a plastic funnel. The crystals are then washed with two 6-mL portions of cold water and allowed to air dry. The yield of 1.4-1.5 g (3.2-3.4mmole) represents 88-94% based on original K2[Pt(CN)4] 3H20. Using X-ray diffraction powder patterns, it is established that the products of both syntheses given above are identical.8 The platinum oxidation state of 2.29(1) is established by iodine-thiosulfate titrations.8... 

To modify this process for using common household materials, one should first look for a replacement for the Buchner funnel. This is easily enough done by heading to the hardware store and getting a plastic funnel with a long narrow stem and a plastic screen in the bottom. This funnel very closely approximates a Buchner funnel. Cost about 2. 

This is the source of the vacuum inside the Mickey s Big Mouth bottle. The stem of the plastic funnel goes through the other hole in the two hole stopper. Greasing the stem of the funnel with vaseline will greatly ease its passage through the two hole stopper. 

When the stirring is done, it is time to filter the now yellow-colored solution. A large coffee filter fitted inside a plastic funnel will do a good job of this. The total volume of liquid amounts to about 3 gallons. Contained in this 3 gallons, is about 3/4 pound of pentaerythritol. Now the real work begins as the workaholic explosives manufacturer isolates his product from the mixture. 

Now it is time to filter out the crude crystals of PETN. A large coffee filter (cafeteria coffee maker size) put into a large plastic funnel will work well. Pour the batch into the funnel at whatever rate it can handle. The acid, water that filters through can be thrown away. The crystals in the filter are rinsed by pouring cold water over them while still in the funnel. About a quart of cold water, slowly poured, trying to reach all crystals will do the job. 

These crystals of PETN are filtered out either by using a vacuum system as shown in the nitromannite section (best) or by pouring them through a coffee filter and wringing them out. Plastic funnels must be avoided, of course. 

When about half of the solution is boiled away, the heat should be removed from the pan and the solution is allowed to cool down to the point where it is about as hot as hot tap water. Then it is filtered through a coffee filter placed inside a plastic funnel. This is to remove any gummy material which may have been formed from the formaldehyde. This gummy stuff will quickly plug the filter, so be prepared to change the filter several times. 

Corn flour or custard powder Plastic funnel and stand to hold it Beaker... 

FIGURE 2 Insertion of the needle into the inner glass tube (igt). The assembly is supported by a truncated plastic funnel (pf). 

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