"CHEMISTRY REVIEW" PROJECT PAGES This Project Page first appeared in the November 1996 issue of Chemistry Review‚ Volume 6‚ Number 2‚ Pages 14 and 15. Chemistry Review is published four times during the academic year by Philip Allan Updates and is a journal for post-16 students. It contains a variety of interesting and colourful articles aimed at 16-19 year-olds taking mainly AS and A2 courses in chemistry. NOTE: Project Page is designed to help you think about your investigation. It is not
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NaHCO3 used ± 0.1 mL | 9.2 | 9.5 | 9.8 | Qualitative Data: * I used the methyl orange indicator which was suitable for my titration because of its clear and distinct colour change from orange to a bright red at the endpoint * At the beginning of the titration after I added 3 drops of methyl orange into the base (NaHCO3) and swirled‚ I began titrating the acid (HCl) slowly‚ and initially in the methyl orange and base‚ there was a tiny amount of red colour present‚ but then it quickly disappeared
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Analysis of Soda Ash and Volumetric Analysis of a Carbonate-Bicarbonate Mixture Buti‚ Mary Daphne A. Department of Chemical Engineering‚ Faculty of Engineering University of Santo Tomas España‚ Manila Abstract Sodium carbonate (Na2CO3)‚ commonly known by trade name soda ash‚ is a white‚ anhydrous‚ powdered or granular material that is an essential raw material used in the manufacturing of glass‚ detergents‚ chemicals‚ and other industrial products. In this experiment‚ the percent alkalinity
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Experiment #6: Colorimetric Determination of pH Almira‚ Faerie Carleen Lucile L. Gallardo‚ Charlotte O. Group #6‚ Chemistry 18.1‚ MHEG1‚ Ma’am Arlou Angeles September 23‚ 2013 I. Abstract The acidity of the four unknown solutions were determined with the use of colorimetry using McIlvaine’s buffer solutions varying in proportion of its constituents (disodium phosphate and citric acid). These buffer solutions were subjected to the addition of corresponding pH indicators and the variation of
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to determine which solution it was. The pH scale is 1-14‚ a pH of 7 is neutral‚ less than 7 is acidic‚ and greater than 7 is acidic. Materials: * pH strips * 20 test tubes * Disposable transfer pipettes * Indicators * Methyl Orange * Bromocresol green * Bromocresol purple * Phenol red * Solutions included * Bleach * Lemon juice * Lemon-lime soda * Baking soda solution * One unknown Procedure: The experiment
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hypothesized the final ester would be octyl acetate. For test tube C I hypothesized it would be methyl salicylate. For test tube D I hypothesized it would be isopentyl acetate. Materials and Methods Apparatus 4 test tubes Test tube rack Graduated cylinder (10 mL) 150 mL beaker 250 mL beakers (2) Hot plate Thermometer Safety glasses Beaker tongs Test tube holder Reagents Methanol Methyl-2-propanol 1-pentanol 1-octanol Acetic acid Formic acid (methanoic acid) Salicylic acid
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of Calcium Hydroxide Apparatus * Solid calcium hydroxide * 0.4 mol/dm hydrochloric acid * Distilled water * Pipette * Triple valve rubber pipette filler * Conical flask * Beaker * White tile * Clamp and stand * Methyl orange indicator Producing the calcium hydroxide solution 1. Roughly fill a beaker with 200cm³ of distilled water. This does not need to be accurate because samples will be taken from this. 2. Add solid calcium hydroxide‚ a spatula at a time
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solution‚ in this case using a orange Gatorade looking the concentration of its dye which is yellow dye #6 and what amount of this Gatorade sample is needed to kill someone. The outcomes in this experiment were that the yellow dye #6 concentration is 5.36 x10-6 M and that the LD50 (lethal dose) is 22‚515 L / KG. Introduction In this experiment‚ we are going to use the Absorption Spectroscopies to determine the level of risk posed to the consumer by the amount of dye present in a commercial
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new and old lemon‚ orange and blackcurrant juice‚ each with varying amounts of vitamin C content. Each experiment has independent and dependent variables. The solutions of soft drinks contain different levels of vitamin C (with old and new varieties) will be the independent variables in the experiment as the vitamin C content is unknown. The dependent variable is the measureable amount of each of these drinks solutions that is required to decolourise a known amount of blue dye. As there are
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NaOH titrated / ± 0.10 cm3 11.80 11.70 11.20 Titration table: data collected from burette of amount of HCl used for the colour of the solution with methyl orange to change Qualitative observation When added with eggshell solution‚ methyl orange turns from orange to pink. When titrated with NaOH‚ methyl orange turns from pink to orange. Bubbles or foams are formed when HCl is added to the eggshells Data processing (3 sig. fig) Error propagation (2 d.p) Average
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