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Topic: Conical flask

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	Erlenmeyer flask -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-09)
		An Erlenmeyer flask (also called conical flask) is a type of (additional info and facts about laboratory glassware) laboratory glassware which consists of an inverted conical base with a cylindrical neck.
		However the main difference is that conical flasks may be stoppered using (additional info and facts about rubber bungs) rubber bungs, so as the contents of the flask may be mixed or transported safely.
		The flask is not usually used when heating substances vigourously, this task usually being left to either the (additional info and facts about round-bottomed flask) round-bottomed flask or flat-bottomed flask.
	www.absoluteastronomy.com /encyclopedia/e/er/erlenmeyer_flask.htm (264 words)

	Finding the Concentration of an Acid.
		The conical flask should be placed underneath the burette so that the solution would run down into it if the valve were open.
		As the conical flask has a certain number of moles measured into it rinsing it with the solution would increase the number of moles in the solution.
		The flask must be empty before the solution is poured into it, otherwise the amount of moles in the solution might be effected.
	www.coursework.info /i/56303.html (934 words)

	Erlenmeyer flask - Wikipedia, the free encyclopedia
		An Erlenmeyer flask (also known as a conical flask) is a type of laboratory glassware which consists of an inverted conical base with a cylindrical neck.
		The main advantages in an Erlenmeyer flask are that it is less likely to tip over than a Florence flask and the smaller neck slows evaporative loss better than a beaker.
		To anchor an Erlenmeyer flask, a 'C' shaped lead or iron weight may be placed over the outside, to keep the flask firmly planted.
	en.wikipedia.org /wiki/Erlenmeyer_flask (182 words)

	AMMONIUM SALTS OF PHOSPHATIDIC ACID (Site not responding. Last check: 2007-10-09)
		The flask should be approximately 2/3 filled with distilled water made slightly acid with dilute sulfuric acid TS and contain a few pieces of sintered glass to prevent bumping when the contents of the flask are vigorously boiled to act as a steam generator.
		Connect the distillation head and splash traps to the distillation flask and vertical condenser, and arrange the condenser such that the outlet dips below the surface of 10 ml of 2% boric acid and 1 ml mixed indicator contained in a 500-ml conical flask.
		Add to the distillation flask, via a funnel attached by means of a short piece of rubber tubing to the steam inlet tube, 75 ml 40% aqueous sodium hydroxide, and wash in with distilled water.
	apps3.fao.org /jecfa/additive_specs/docs/8/additive-0791.htm (1344 words)

	Off-tastes in raw and reconstituted milk (Site not responding. Last check: 2007-10-09)
		Titrate the content of the conical flask by adding the sodium hydroxide solution, while swirling until a faint pink colour similar to the colour standard persists for about 5 sec.
		Connect the flask immediately to the distillation apparatus and warm it gently until the free fatty acids form a clear surface layer.
		Mix the contents of the measuring flask by gentle shaking and immerse the flask in a waterbath at 20 ± 1°C for 10 to 15 minutes, the 110 ml mark on the flask being 1 cm below the level of the water in the waterbath and the flask being turned from time to time.
	www.fao.org /DOCREP/003/X6537E/X6537E05.htm (7925 words)

	Volumetric Analysis
		Re-weigh the flask and calculate the actual mass of the Na in the flask.
		Slowly add the HCl from the burette to the flask until the colour begins to change and record the volume of HCl used.
		Slowly add the HCl from the burette to the flask until the colour begins to change and record the volume of HCl uesd.
	hometown.aol.com.au /Frathom40/Page11.html (697 words)

	guichett - 31985L0503 - (Site not responding. Last check: 2007-10-09)
		Mix the contents of the flask carefully and heat the flask in a water bath at 60 to 65 °C. If the litmus paper colours blue within 15 minutes ammonia is present, and the method is not applicable (see Section 1).
		Place the conical flask under the condenser (5.4) so that the tip of the outlet tube (5.5) is immersed in the boric acid solution.
		During this operation, hold the flask in an inclined position so that the sodium hydroxide solution runs down the side of the flask to form a bottom layer.
	europa.eu.int /smartapi/cgi/sga_doc?smartapi!celexapi!prod!CELEXnumdoc&lg=EN&numdoc=31985L0503&model=guichett (5355 words)

	Middle Part Concentration Page
		Place the conical flask under a burette filled with the solution of acid.
		Keep a careful eye on the colour of the indicator in the conical flask and when it changes stop adding the acid from the burette.
		A volumetric flask is used to measure the exact volume of water.
	www.rjclarkson.demon.co.uk /middle/middle1.htm (392 words)

	Aliero. Larvaecidal effects of aqueous extracts of Azadirachta indica (neem) on the larvae of Anopheles mosquito. Afr. ...
		The paste was compressed to extract oil which was collected in a round bottom conical flask.
		This was then gradually passed on wire gauze on top of a conical flask and carefully pressed to extract the liquid which collect in a flask placed below the wire gauze.
		From the finer material, 10 was measured and dissolved in 100 ml distilled water in a conical flask.
	www.academicjournals.org /ajb/manuscripts/manuscripts2003/Septembermanuscripts2003/Aliero/Aliero.htm (936 words)

	Aspirin Investigation (Site not responding. Last check: 2007-10-09)
		When the flask has cooled pour the contents into a conical flask surrounded by crushed ice in a large beaker.
		A known mass of the aspirin was weighed and placed in a conical flask.
		A filter funnel was placed in the mouth of the flask to prevent splashing and the mixture was simmered gently for about 10 minutes to complete the hydrolysis.
	www.coursework.info /i/12128.html (691 words)

	Flasks Information conical flask (Site not responding. Last check: 2007-10-09)
		Sometimes when you're trying to find better-quality information about conical flask, you'll find it hard unscrambling quality advice from inexpert conical flask submissions or guidance so it is wise to know how to qualify the information you are given.
		A good hint to track when you're presented with information and advice about a conical flask article is to ascertain who owns the site.
		Doing this could reveal the owners conical flask integrity The quickest way to work out who owns the conical flask website is to look on the 'about' page or 'contact' page.
	www.flasks-info.info /conical-flask.htm (211 words)

	Inding the Concentration of Hydrochloric Acid by Titration
		When transferring this into the conical flask a tiny amount of solution will be left in the pipette which is impossible to get out.
		Once 10ml of solution are in the conical flask, two drops of screened methyl orange indicator should be dropped into the solution.
		A white tile must be placed under the conical flask so that the colour of the solution can be easily seen.
	www.coursework.info /i/25898.html (376 words)

	Untitled Document
		Add to one of the conical flasks 2 ml of the reference colour solution (3.2) to obtain a colour standard and mix by slight shaking.
		Titrate the contents of the second conical flask while shaking, by adding the sodium hydroxie solution (3.1) from the burette (4.2) until a faint pink colour similar to that of the colour standard persists for about 5 seconds.
		Wash the beaker into the flask and fill the rest of it with distilled water up to the etched mark level.
	www.apeda.com /apeda/milk_products/I_6_1.html (674 words)

	Apeda : EU REGULATIONS
		Weigh 10 g of the sample in a 250 ml conical flask.
		Pour the neutralized alcohol on ghee in the flask and titrate with 0.1 N sodium hydroxide, shaking vigorously during the titration.
		The end point of titration is reached when the addition of a single drop produces a slight but definite colour change persisting for atleast 15 seconds.
	www.apeda.com /apeda/milk_products/I_38.html (191 words)

	Commonion
		This fact is made use of in quantitative (gravimetric) precipitation reactions, where an excess of the precipitating reagent is usually added to reduce the solubility of the precipitate as much as is possible.
		Filter this solution into a clean dry flask, and stopper to prevent the absorbtion of carbon dioxide.
		conical flask, add 3 – 4 drops of screened methyl orange (or methyl orange) indicator, and titrate with standard 0.0100 mol dm
	www.rod.beavon.clara.net /commonio.htm (237 words)

	[No title]
		Accurately weigh approximately a I gm sample of ground tobacco into 100 ml conical flask and add 20 ml of chloroform and 20 ml of carbon dioxide- free distilled water from measuring cylinders.
		NJ BATCo document for Province of British Columbia 21 April 1999 -4- The percentage of nicotine alkaloids extracted with chloroform is "'Clic 13 X 100 "CHC 13 +1..IH20 + "Res where ICHCL@,' `.@j,o and 'Res are the weights/gm in the chloroform layer, water layer and tobacco residues respectively.
		An alternative, more quantitative, method can be adopted by pipetting the 20 ml of chloroform and 20 ml of carbon dioxide-free distilled water into the conical flasks then pipetting 5 ml a I iquot from each layer in the separating funnels for nicotine alkaloids analysis.
	www.library.ucsf.edu /tobacco/batco/OCR/1400/1429.txt (722 words)

	tas989
		Stopper the flask, shake it and allow to settle.
		Stopper the flask, shake it and allow the layers to settle.
		Filter this solution into a pear-shaped flask and distil it to near dryness collecting the fraction between 73 and 76 deg.
	ourworld.compuserve.com /homepages/alexckw/tas97.htm (458 words)

	Erlenmeyer -- Recommendations and Resources (Site not responding. Last check: 2007-10-09)
		The flask is not usually used when heating substances vigorously, this task usually being left to either the round-bottomed flask or flat-bottomed flask.
		His experimental work included the discovery and synthesis of several organic compounds, e.g., isobutyric acid (1865); in 1861 he invented the conical flask that bears his name.
		Among the first to adopt structural formulas based on valence, he proposed the modern naphthalene formula of two benzene rings sharing two carbon atoms.
	www.becomingapediatrician.com /health/48/erlenmeyer.html (369 words)

	Reaction 11.2, p.297. Measurement of an equilibrium constant Kc.
		Adjust the pipettes so that at the beginning take a little bit more, raise the pipette out of the solution, holding it in the level of my eyes drop the quantity until it's exact.
		It is necessary to leave the flask closed overnight to let the reactants achieve their equilibrium states.
		If the flask would be open then some of the reactants might evaporate or react with dust from air.
	www.ieg.ee /keith/docs/keskkoolKEEMIA/112EQREA.htm (184 words)

	Copper sulfate electrolysis (Site not responding. Last check: 2007-10-09)
		Other equipment needed: one 10 mL conical flask, a few centimetres of clean copper wire approx 1 mm diameter, concentrated copper sulfate solution (at least 1M), cotton wool, source of low-voltage DC current, with potentiometer to regulate cell voltage, electric leads, voltmeter (or multimeter) to monitor cell voltage.
		A piece of clean copper wire, about 1mm in diameter, is cut and bent so that it hooks over the rim of a 10 mL conical flask with the lower end of the wire a few millimetres above the bottom of the flask; this will be the cathode.
		The mass of the whole assembly: flask, solution, two electrodes, and cotton wool is then recorded to the nearest millligram.
	chem.lapeer.org /Chem1Docs/CuSO4Elect.html (621 words)

	[No title]
		In a titration, 25.00cm3of sodium hydroxide solution were pipetted into a conical flask.
		A 0.100 mol dm-3 solution of sulphuric acid was run into the flask from a burette.
		An indicator in the flask changed colour when 22.00cm3 of the acid had been added.
	www.york.ac.uk /org/seg/salters/chemistry/word/Spotthemistake.doc (641 words)

	Agar plate - Open Encyclopedia (Site not responding. Last check: 2007-10-09)
		It usually necessary to gently boil the mixture to facilitate dissolving: this can be done in a microwave oven, or over a gentle flame.
		This will be used to sterilise the mouth of the flask, and also provides a reasonably sterile environment in the vicinity.
		Before inoculation, important information is written on the bottom of the plates, close to the rim:
	open-encyclopedia.com /Agar_plate (1216 words)

	Random Ravings: Bromothymol Blue
		In it went into the conical flask and I started to titrate as usual albeit into a reddish solution of acetic acid.
		I happily squirted colourless liquid into more colourless liquid with bits of red paper until, suddenly, for a magical moment, a stream of smoke erupted from the vibrating flask, followed by a loud explosion, rending the relative silence seconds before.
		She would have slammed the conical flask over my head and told me to "get out".
	ravion.blogspot.com /2005/07/bromothymol-blue.html (440 words)

	AAAFAQ04 (How do I regenerate my AAA Column?) (Site not responding. Last check: 2007-10-09)
		Pour 100ml of Distilled water and 100ml of Methanol into a flask with a PTFE circular magnetic stirrer.
		Remove the conical flask from the hotplate and add 100ml of distilled water to the flask to dilute and cool down the mixture.
		If the resin is required in sodium form then suspend the resin in the 200ml aliquot of 4M sodium hydroxide in the conical flask.
	www.biochrom.co.uk /faq/aaa/aaafaq04.htm (623 words)

	Erlenmeyer Flasks: Autoclavable Conical Glass Flask for Storing Liquids.
		Erlenmeyer flasks are commonly used for simple measuring, storing and mixing of liquids.
		An erlenmeyer flask can also be used as a wine or juice container or culture chamber.
		Erlenmeyer flasks are resistant to breakage due to heating or chemical attack.
	www.indigo.com /glass/erlenmeyer-flasks.html (182 words)

	Parts List
		The 100ml volumetric flask is used for accurate dilutions, such as diluting a 0.1 M NaOH solution to 0.01 M NaOH soln.
		The 100 ml conical flask is a convenient flask as its contents is able to be contained while mixing with a swirling motion.
		The eye droppers are used to adjust the colour of the hydrogen peroxide solution in the pear shaped flask using the 0.1 M sodium hydroxide or hydrochloric acid solutions, one drop at a time.
	www.monashscientific.com.au /PartsList.htm (2867 words)

	Tephrabase: Acid Digestion Techniques (Site not responding. Last check: 2007-10-09)
		Place the peat sample in a conical flask (eg 150 ml) and break into smaller pieces.
		Once the foam disappears quickly after the flask is shaken place the flask on a hot plate.
		Very carefully decant the liquid from the flask leaving enough in the bottom to keep the sediment..
	www.geo.ed.ac.uk /tephra/acid1.html (410 words)

	[No title]
		A Conical flask is placed in water baths of varying temperatures.
		MATERIALS Data logging system 125 ml Conical flask Gas Pressure sensor four 1L beakers Temperature probe Ice 1 Hole stopper Hot plate PROCEDURE Prepare four water baths, one with boiling water, one with Hot tap water, one with room temperature water, and one with iced water.
		Close the side arm of the pressure sensor, so that the air sample is now confined to the flask.
	homepage.eircom.net /~datalogging/preststu.doc (457 words)

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