"Berlese funnel" Essays and Research Papers

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    Prepare a vacuum filtration assembly using two 250-mL side-arm filter flasks‚ a 5.5-cm Buchner funnel (with a Filtervac or neoprene adapter)‚ and two lengths (each 12 in.) of vacuum tubing. [N.B. We use the second flask so between the aspirator and our filter flask so that the filtrate will not become contaminated if tap water is pulled back through the hose.] Place a piece of filter paper into the Buchner funnel so

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    used a pressure tube to find out that a ping-pong ball could stand up to 90 PSI. They also said that they used a long three inch diameter tube‚ to which they put a funnel in one end and the other end into the boat that they had sealed up. They then put several ping-pong balls in the funnel at a time and put a garden hose in the funnel so that the water‚ pulled by gravity‚ would "wash" the balls down‚ filling the boat. Jamie also noted that one of Adam’s seals‚ had failed and several hundred ping-pong

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    a mixture being in each form. Materials: Four 250ml beakers 200ml of 0.01m salt solution. 200ml of colloid milk( mix two teaspoons of milk powder in 200ml of water) 200ml of suspension (muddy water‚ diluted water-based paint) Filter paper Filter funnel‚ Retort stands Laser light Precautions: When using laser light‚ make sure that the light doesn’t enter your eyes. Do not look directly at the light and make sure there are no reflections from the glass or other surfaces. Method: 1. Take three 250ml

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    In the fume hood‚ approximately 2g of Ca(OH)2 was dumped from a vail into a 250ml beaker. To avoid any left-over Ca(OH)2 inside the vail‚ certain amount of distill water wad added to it‚ and the vail was shook several times after the lid was closed. Pouring the solution in the vail into the beaker‚ and add distill water until it reached the 100ml line. Then‚ the beaker was put on top of a magnetic stir with a magnetic stir bar placed in it. Turning on the magnetic stirrer and allowing the stir bar

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    equation: Na2CO3 + 2HCl → 2NaCl + H2O + CO2 Materials / Apparatus: 1) 8.00g of sodium carbonate‚ 2) 30mL of hydrochloric acid (6molL-1) 3) 100mL of hydrochloric acid (6molL-1) 4) 100mL conical flask‚ 5) 150mL glass beaker 6) 50mL glass beaker 7) Glass funnel‚ 8) Digital scales‚ 9) Metal spatula and a 10) Disposable plastic pipette. Procedure: (for 2molL-1) 1) Weigh an empty conical flask and record its weight. 2) Keep empty conical flask on digital scale‚ and with a metal

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    This will ensure that the solvent and coffee don’t mix together‚ and will instead form two separate layers that will allow for extraction in the separatory funnels. Dichloromethane is the ideal solvent because it is immiscible with the water‚ and will allow caffeine to be dissolved in it2. The filtration that happens in the separatory funnels isolates the caffeine and the dichloromethane. The magnesium sulfate helps dry the combined layers of caffeine and dichloromethane‚ and then the evaporation

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    Abstract The preparation of 7.7-dichlorobicyclo [4.1.0]heptane which is also known as 7‚7-dichloronorcarane was done by reacting cyclohexene ‚ chloroform and a base( 50% aqueous sodium hydroxide) with benzyl triethylammonium chloride. The latter being a water soluble phase transfer catalyst (PTC).reaction was performed at room temperature and was distilled at atmospheric pressure. The mechanism of action of the above mentioned PTC is described in the text along with the mechanism for the addition

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    Extracting NaCl from Rock Salt and assessing its purity Aim The aim of this experiment was to obtain a pure product from a solution through the processes o extraction‚ filtering and evaporation. Introduction Extraction is used when trying to separate or purify a product. For an extraction to be successful the substance used to make the solvent should readily dissolve. The substance used in this practical was rock salt. The liquid used should not react with the substance that needs extracting

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    lala

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    ethanol. After 2 -3 minutes‚ yellow cloudiness formed. After 10 minutes add the remainder of the solution. Allow the solution to stir for 30 more minutes. 6. Filter the mixture using a Buchner funnel and transfer the product into a large beaker with 300mL of water. 7. Refilter the mixture with the same Buchner funnel and weigh the final product. 8. Measure the melting point of the final product using the Mel temp. Results Final Yield: 6.660g Melting

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    BACKGROUND OF THE STUDY Pest insects are based on the potential damage on human purpose. They cause damage to the agricultural crops‚ consume and or damage harvested food‚ cause illness or unproductively to agricultural animals‚ and vector human disease. For centuries man had made innovative ways in combining pest insects‚ which leads to the invention of insecticides. Though insecticides contributed big in the elimination of pest insects‚ it also contributed ecological alteration due to its toxic

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