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ch116sugarsolutionsreport - solution concentration original...

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CH116-J1 Week of September 15, 2008 Lab #3: Sugar Solutions: Density, Calibration Curves, and Concentration 1. Description of the Procedure Used. a. Using a dilution calculation, find the amount of initial sugar solution with a 20% concentration that you need to make a 25 mL sugar solution of 5, 10, and 15% concentration. b. For the 5% concentration, measure the amount of initial sugar solution with a 20% concentration you need and pour it into a flask. Then pour enough water into the flask to make the total volume equal 25 mL. c. Measure the mass of a small beaker. d. Measure the mass of your 5% sugar solution in the beaker. e. Calculate the mass of the 5% sugar solution. f. Repeat steps b though e for the 10 and 15% solutions. g. To find the unknown solution, measure an initial and final volume with a pipette and then find the overall volume of your unknown solution. Measure the mass in the small beaker and calculate density. 2. Dilutions. To prepare a series of dilutions from a stock solution, use a dilution calculation. Use your desired
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Unformatted text preview: solution concentration, original solution concentration, and final volume to find the initial amount of the original solution you must use. Follow the amounts used in your dilution calculation to make the actual final solution with the new concentration. 3. Solution Concentration. Concentrations of solutions are very important in the real-world. For instance, vinegar contains a specific amount of acetic acid, and if too much acetic acid is added, the vinegar can be harmful to your body. This is the same for many skin products with skin treating chemicals, like salicylic acid and benzoyl peroxide. 4. The Calibration Curve. Concentration and density seem to have a relationship of one to one. The relationship could be seen better if the graph had more points plotted on it. More points on the graph would make it more accurate and acceptable. 5. Concentration of the “Unknown”. The unknown solution of batch 561 is 26.1 ± 0.3%....
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