To: Dr. Schmidt From: The STEMinists Subject: Memo #3: Critical Design Review Date: November‚ 1 2017 This is a critical design review for the escape room design project. First‚ the review contains a final sketch of the team’s concept design including specific dimensions and illustrations of all of the different functions. Next‚ both proofs of concept one and two are presented and analyzed based on results from the initial testing. These were incorporated into the alpha prototype which is then
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Extraction of Caffeine from Tea Leaves using Dichloromethane (CH2Cl2) Abstract The extraction of caffeine (C8H10N402) was done in two parts. The first procedure used was solid-liquid extraction which was done by boiling the tea leaves in 100 ml. distilled water for 5-10 minutes. The filtrate was acquired and was extracted again by liquid-liquid extraction using dichloromethane (CH2Cl2). The combined DCM (CH2Cl2) was washed and dried to yield crude caffeine. The crude caffeine was purified
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percent yield to change depending on how the contamination affected the substances by producing a higher or lower percent yield. Another source of error could have been due to the transport of the aspirin from the Erlenmeyer flask after cooling to the funnel to be filtered. Some of the aspirin may have been lost or left behind and that would have showed a lower percent
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sample of impure scrap aluminum from a common beverage can. The sample will be passed through a filter paper using a funnel‚ after being boiled on a hot plate in a fume hood and dissolved in a solution of potassium hydroxide to remove the impurities. By adding an excess of sulfuric acid and cooling the solution in an ice bath‚ the technique of vacuum filtration using a Buchner funnel will be employed‚ crystals of the hydrated aluminum potassium sulfate salt will yield and these will be collected. Methanol
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instructions to set up a filtration assembly. * Swirl the contents of the beaker to dislodge any precipitate from the sides. Then‚ while holding the filter paper in place and open‚ slowly pour the content of the beaker into the filter paperlined funnel. Be careful to not let the solution overflow the level of
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to understand the basic separation techniques to conduct this lab safe and effectively. They had to setup a simple distillation to distill the mixture quickly once the reaction took place. The distillate then had to be transferred to a separatory funnel to further separate. By following the
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heat to evaporate a liquid leaving behind any substance not chemically bonded to the H2O. Also‚ an oven will be used to get rid of leftover moisture in the sand. To filter the sand from the salt water‚ the salt water will be filtered through a funnel lined with filter paper into a beaker from a iron ring. This is possible because the salt is soluble and will dissolve in water as the sand is insoluble and will not dissolve in water there for staying on top of the filter paper as the salt water
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up using a separate mortar and pestle. The grinded up pills were then weighed. The grinded up pills were placed in separate beakers each containing 10 ml of Acetone. Once the pills had dissolved in the acetone‚ a vacuum filtration‚ using a hirsch funnel‚ was performed in order to separate out the insoluble components of the pill. The solids were
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last step is the distillation. This step is to distill off impurities by heating the solution; the heat will boil the solution evaporating the impurities‚ leaving only ester. Apparatus and materials: Round bottomed flask‚ condenser‚ separating funnel‚ Bunsen Burner‚ thermometer‚ carbon tetrachloride‚ anhydrous sodium sulphate‚ benzoic acid‚ methanol‚ conc. Sulphuric acid‚ anti-bumping granules‚ rotary evaporator. Procedure: 1) 12.2g of benzoic acid was placed in a 250ml round bottomed flask
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a group 1 element because substance Z is a soluble metal carbonate and would most likely be sodium or potassium because these elements are commonly used. Materials 100 cm3 beaker‚ 250 cm3 beaker‚ 250 cm3 volumetric flask with stopper‚ filter funnel‚ glass pipette‚ glass rod‚ de-ionized water‚ Substance Z‚ 25 cm3 bulb pipette‚ pipette filter‚ 250 cm3 conical flask‚ burette‚ burette stand & holder‚ 0.1225 M hydrochloric acid‚ methyl orange indicator. Procedure: Part 1: Making a standard solution
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