Introduction: The main objective in this experiment is to determine if the claims made by the US government‚ regarding the spectrophotometric analysis of a copper penny hold true. Before 1982‚ the Lincoln cent contained 95% copper and 5% various mixtures of zinc and tin. As the cost of copper increased‚ the cost to produce the penny was more than the actual face value of the penny. This caused the US government to change the composition of the penny. The pennies we know today consist of a copper
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filling a buret clamped to a ring stand with solution one and slowly transferring it to solution two in a flask underneath the buret. In solution two‚ a certain amount of some indicator must be dropped into the flask for the endpoint to be visibly reached. This process would be repeated multiple times to eliminate random error. (Svante) In this lab the base NaOH will be used to fill the buret and act as the titrant. Then flasks of acetic acid solution will be placed beneath the buret full of
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Michelle Fishman Period 11 TCA #3 TITLE: Egg Shell Lab OBJECTIVE: To determine and compare the amount of calcium carbonate content of brown and white eggshells. MATERIALS: white and brown eggshells‚ water‚ deionized water‚ beaker‚ pipet‚ flask‚ test tube brush‚ funnel‚ hotplate‚ mortar‚ pestle‚ ethanol‚ HCl‚ phenolphthalein indicator‚ sodium hydroxide PROCEDURE: (Complete for both white and brown eggshells) 1. Get one egg and beaker and bring it to your lab station. 2. Break the egg into
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a sodium salt. Objectives: 1. Measure the pH of the unknown solution first with indicators and then with pH paper. 2. compare the buffer solution with both a strong acid and a weak acid materials: 2 30 mL beakers 2 100mL volumetric flask 1 10mL pipet 2 aspirator 1 50mL graduated cylinder 1 10mL graduated cylinder 1 50mL beaker 1 100 mL beaker 1 glass stir rod 1 ring stand 1 clamp 1 250mL beaker Distilled water pH paper reagents: 10mL 6M acetic acid 10g solid sodium
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entropy (randomness)‚ and free energy (G) changes associated with the system in question. Materials: 125mL flasks (5)‚ 100mL beaker (1)‚ hotplate‚ graduated cylinder‚ stir rod‚ borax‚ water‚ thermometer‚ pipet‚ bromcresol green‚ distilled water‚ 0.5M HCL solution‚ titrating kit (stand and buret) Procedures: 1) Five clean 125mL flasks were labeled from 30*C to 50*C in increments of 5*C. 2) 5mL water was added to each flask. 3) 30-32g of borax was weighed and placed in a 100mL flask and
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Purpose The purpose of this experiment is to determine the rate constants‚ k1‚ for the methyl acetate hydrolysis reaction at 25 °C and 35 °C‚ as well as the overall activation energy of the reaction. Methods Methyl acetate was placed in an HCl solution‚ in which it reacts with water to form acetic acid over time. At each time interval‚ an aliquot of the mixture was removed for titration against NaOH to determine the concentration of the acetic acid produced. From the amount of acetic acid produced
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The equipment needed when making standard solutions includes; a volumetric flask‚ a glass beaker‚ two plastic weighing boats‚ scales‚ a spatula‚ and the sodium hydroxide. When using glassware in experiments‚ it must be flushed out to make sure that cross contamination does not happen and that the only thing that would then be coating the beaker is the distilled water. When all of the glassware has been cleaned‚ some sodium hydroxide should be placed in a plastic weighing boat next to the scales
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Spectrophotometric Determination of Equilibrium Formal Report Matt DeLuca The Department of Chemistry‚ SUNY College at Brockport Brockport‚ NY 14420 CHM 206.04 Abstract: The main objective of this experiment was incorporating the use of spectrophotometry in an attempt to study the position of equilibrium. Furthermore‚ after the completion of this experiment‚ the formation of the equilibrium constant of the iron thiocyanate complex
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Standard Methods for the Examination of Water and Wastewater 5210 BIOCHEMICAL OXYGEN DEMAND (BOD)*#(1) 5220 CHEMICAL OXYGEN DEMAND (COD)*#(2) 5220 A. Introduction Chemical oxygen demand (COD) is defined as the amount of a specified oxidant that reacts with the sample under controlled conditions. The quantity of oxidant consumed is expressed in terms of its oxygen equivalence. Because of its unique chemical properties‚ the dichromate ion (Cr2O72–) is the specified oxidant in Methods
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Hamza Aziz General Chemistry I Lab 09/12/2007 Lab 7 Density of Sprite and Diet Sprite Abstract: The density of regular Sprite was found to be 1.037 +/- g/mL. compared to Diet Sprite which was 0.9965 +/- g/mL. Among the three volumetric glassware Pipette was most precise (ó=0.0016 g/mL). Burette was the second best (ó=0.0023 g/mL) and graduated cylinder was the least precise (ó= 0.007 g/mL). Density was found to be intensive property. The slope of the graph of mass against volume was 1.05
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