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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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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Photosynthesis Investigation Research Question How does length of pondweed affect the amount of bubbles produced in 2 minutes by pondweed during the process of photosynthesis? Independent variable: Length of pondweed (8/10/12 cm). Dependent variables: amount of bubbles produced in 2 minutes. Control variables: Volume of water in the beaker (500ml)‚ The volume of water has to be the same every time‚ so when doing the experiment I need to make sure I always use these 500 ml that i have already
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attributed to loosing crystals in each transferring step. When the product was poured into the funnel a lot of the crystals were retained at the bottom of the test tube. Then when washing the test tube out with solution some of the crystals were suspended back into solution because the solution used was not ice cold. For further experiments this step will only use chilled solvents when washing the crystals in the funnel and the test tube to avoid having yields this low again. Since we started with such a
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Water Quality and Contamination Research and its Importance Ursurla L. C. Waller SCI 207 Dependence of Man on the Environment Professor Wayne Davis 2014 September 20 Abstract This report analyses the ability of ordinary substances to pollute water sources‚ filtration techniques‚ as well as the quality of tap and bottled waters. This report discusses the availability of clean water sources‚ factors that affects the quality of water‚ agents of water contamination‚ and how the earth naturally filters
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