for waste. Obtaining each different solution was through three different burets. Last but not least‚ pipets were needed to transfer solutions; this calls for a 5.0mL pipet and an optional disposable pipet. Collect 50mL of pH buffer solution the pour it into the 150mL beaker. The pH of the buffer solution was 6.83. After pouring the pH solution into the 150mL beaker‚ add 20 drops of bromothymol blue solution. Using a pipet agitation of the solution can be helpful to see the color change. The color
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Errors and Uncertainty in Experimental Data Causes and Types of Errors Conducting research in any science course is dependent upon obtaining measurements. No measure is ever exact due to errors in instrumentation and measuring skills. If you were to obtain the mass of an object with a digital balance‚ the reading gives you a measure with a specific set of values. We can assume that the actual measure lies either slightly above or slightly below that reading. The range is the uncertainly of
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test tube with water. * Pour the water from the test tube into the 25 mL graduated Cylinder. Record the volume of the water below. Empty the graduated cylinder. * Determine the volume of a thin –stemmed pipet: a) Completely fill a clean‚ empty pipet with water. b) Hold the pipet vertically multiple times to expel
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Volumetric glassware‚ such as a conical flask‚ pipette or the burette might have accumulated a systematic error. For example; the burette is not precise when determining the endpoint. It is a random error‚ but it can also be a systemic error due to the calibration of the glassware used in this experiment. A systematic error occurred during this experiment was the inaccuracy of the measuring
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Acid and Base Titrations: Preparing Standardized Solutions Introduction: This experiment focuses on titrations of acids and bases. A titration depends on addition of a known volume of solution and is a type of volumetric analysis. Many titrations involve either acid-base reactions or oxidation-reduction reactions. In this experiment we do one of each. We monitor the pH of the reaction with the use of a color indicator. We also learn about the standardization of bases (NaOH) and acids (HCl) which
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Purity of Aspirin Objectives - To research‚ using various sources‚ the history of aspirin‚ its use in medicine‚ methods of synthesizing it and of measuring its purity - To compare the % purity of a branded aspirin tablet with a generic aspirin tablet - To compare 2 methods of composition analysis of the two types of aspirin Research
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A Study to Determine the Level of Iron and Copper in Kuala Terengganu Estuary Muhammad Ali Azraei Bin Raduan ( UK32844 ) Lecturer Dr. Kesaven a/l Bhubalan Introduction : Kuala Terengganu River estuary (5.32°-5.35°N‚ 102.95°-103.15°E) is situated on the east coast of peninsular Malaysia facing the South China Sea (figure 1). Generally‚ the Kuala Terengganu River estuary is relatively small and shallow. The total area of the estuary is approximately 8 km2
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To construct a calibration curve‚ three samples with different known concentrations and a blank solution are prepared and their absorbances are measured with a UV-Vis spectrophotometer (Table 1). The absorbances of three unknown samples with same concentration and a blank are measured (Table 2). The blank solutions are used as a reference solution to calibrate the colorimeter. The volumes of Fe solution for the delivery volume errors in the 10 ml graduated pipet are corrected (Table 3). The molarity
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equivalence point is reached‚ where the number of moles of acid is equal to the number of moles of base. This point is usually marked by observing a color change in an added indicator. In a titration‚ the standard solution goes in a buret‚ which is a piece of glassware used to measure the volume of solvent to approximately 0.1 mL of accuracy. The solution that you are titrating goes in an Erlenmeyer flask‚ which should be large enough to accommodate both your sample and the standard solution you
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TITLE: Determination of Riboflavin by using UV-Vis spectrophotometry. ABSTRACT: The amount of Riboflavin in various brand of children multivitamins was determine by using UV-Vis spectroscopy instrument‚ the series of standard of riboflavin was prepared in order to determine the amount of the riboflavin in the sample of children multivitamins. The maximum amount of riboflavin was found in the Champs multivitamin that contains 0.1155 mg followed by Chewies 0.1131 mg and Scott’s 0.0672 mg. OBJECTIVES:
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