Rossi/Kuwata Chemistry 222 Spring 2011 Experiment 2: Spectrophotometric Determination of Iron in Vitamin Tablets (Adapted from Daniel C. Harris’ Quantitative Chemical Analysis and R. C. Atkins‚ Journal of Chemical Education 1975‚ 52‚ 550.) Experimental work to be done on February 24 + one hour scheduled on your own Notebook due on March 4 (by 4:00 pm ⇒ 20% late penalty each 24 hour period thereafter) INTRODUCTION In this experiment‚ you will dissolve the iron in a vitamin supplement tablet‚
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added 1.25 mL of sulfuric acid. We added distilled water to make 500 mL. We dissolved 0.1005 g of 1‚10-phenanthroline in a 100 mL volumetric flask. We then prepared 25 mL hydroquinone solution containing 0.2510 g of hydroquinone. In a 250 mL volumetric flask 6.2515 g of sodium citrate was used and distilled water was filled to the mark. Five 100 mL volumetric flasks were filled with 1.00‚ 2.00‚ 5.00‚ 10.00‚ and 25.00 mL of standard Fe solution. To each flask sodium citrate was added until
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acid(CH3COOH) in a commercial vinegar using titration method. Chemical reaction involved: CH3COOH(aq) + NaOH(aq)→ NaCH3COO(aq) + H2O(l) Apparatus: An electronic balance‚ a 10.0cm3 pipette‚ a 25.0cm3 pipette‚ a pipette filler‚ a 250.0cm3 volumetric flask‚ a burette‚ stand and clamp‚ a conical flask‚ a white tile‚ 3 large beakers‚ a small beaker‚ a dropper‚ a boiling tube‚ a rinsing bottle Chemicals: 0.1M NaOH(aq)‚phenolphthalein indicator‚ commercial vinegar (5% acidity)‚ distilled water
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solution up to the mark of the volumetric flask. Due to these the concentration of the prepared solution can make any changes. The error in measuring the mass of the CuSO4 and preparation of the solution in the 100cm3 of volumetric flask‚ pipetting out the solution. The calibration curve is not going through the zero level because the exact 100ml of 0.4M CuSO4 is prepared for the experiment but during the practical the water level was increase than the 100ml mark in volumetric flask. So‚ it makes error
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SEMESTER- I PRACTICAL- I VOLUMETRIC ANALYSIS The method to determine the exact amount of the substance in a given sample is termed as quantitative analysis volumetric analysis is a branch of quantitative analysis involving accurate measurement of volumes of reacting solutions. The volumetric analysis is very much in use due to simplicity rapidity accuracy and wide applicability. The reacting substances are taken in the form of solutions and made to react. The concentration of one solution is
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were used to figure the molecular weight of the sugar‚ and the number of moles of sugar in the volumetric flask. There was also an equation to figure the Molarity‚ as well. As a result of the experiment‚ I now have a better understanding of the density of a concentration‚ and what Molarity is . Observations Data Table 8: Initial Concentration Chemical Mass (g) Molecular Weight (g) Moles in Volumetric Flask Total Volume (L) Molarity (mol/L) Sugar (C12H22O11) 8 331.23 0.02415 25 0.9961 *As
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Experiment 5 Title: Volumetric Analysis – stoichiometry Purpose: To determine the exact concentration of a monobasic acid‚ HX (KA1) Materials and apparatus: 1. Volumetric flask and stopper (250cm3) 2. Electric balance ±0.01 g 3. Pipette and pipette filler (25cm3) 4. Volumetric flask and stopper (100cm3) 5. Burettes (50cm3) 6. Retort stand and clamp 7. White tile 8. Wash bottle filled with distilled water 9. Spatula 10. Titration
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was evaluated by diluting (1 mg/mL standard) 2.0 mL of dye to 100 mL. The absorbance of each dye standard was measured and documented. The absorbance of the Gatorade was then measured by diluting the solution and pipetting 5.0 mL into a 25.0 mL volumetric flask. The absorption spectrum of the chosen drink was measured. Next‚ the purple Gatorade extraction procedure was carried out‚ beginning with pipetting 1 mL of 70% isopropanol (IPA) and 1 mL of saturated salt water into test tube 1 (solution 1)
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Calcium is an essential element for the growth and development of teeth and bones. Most of the Calcium is gained from cereals‚ fruits and vegetables‚ these foods are known to have around 10 mg of Calcium per 100 grams. A predominantly eminent intake in childhood Calcium is responsible for the bone mass in adults and it also affects the rate of bone growth. Lentils are a great source of naturally available Calcium. The regular intake of Calcium can reduce the risks of Osteoporosis‚ a disease where
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I have always seen paper clips as a useful material. I believe that paper clips are a part of my culture due to the 7 m high statue of paper clips situated in my home-country Norway. During World War II the statue symbolized Norwegian nationalism‚ and it was due to John Vaaler the man who invented paper clips that the statue is in Norway today. Paper clips are made from galvanized steel wire‚ meaning that the iron content is less than 100% because it also contains zinc. The galvanization method
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