Chemistry Laboratory Report Experiment #28: Hardness of Water Student: Assem Abichshayeva Lab. Partner: Marat Aitkhozha Dr.Brad Logsdon Date: 22.04.13 Purpose: The main purpose of this experiment is to standardize a solution of EDTA by titration against a standard solution made from calcium carbonate‚ CaCO3. Procedure: A 50-mL buret‚ a 250-mL volumetric flask‚ and 25- and 50-mL pipets were obtained from stockroom. The 0.5 g of calcium carbonate was weighted in a small 50-mL beaker.
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Why does the colour leak out of beetroot? Procedure to investigate the effect of temperature Hypothesis- The higher the temperature while cooking the beetroot‚ the more pigments well leak out from the cell membrane‚ hence the absorbance would increase. My hypothesis was concluded by the facts that beetroot contains red pigments called betalians which are located in the cell vacuole. Normally the pigments cannot leak out; however cooking the beetroot allows the movement. This is because the cell
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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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electrothermal device to determine melting point. Chemicals : Crude diphenyl (3.0 g)‚ ethanol (20 mL)‚ decolourising charcoal (1.0 g)‚ boiling chips‚ ice Procedure : Crude diphenyl (3.0 g) is measured and obtained using a beaker and a laboratory electronic weigh. The crude diphenyl is then put into a quickfit flask‚ together with 2 to 3 pieces of boiling chips. Ethanol (5 mL) is measured using a measuring cylinder and poured into the flask. A vertical water condenser is fitted to the mouth
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equilibrium constant for the formation of the complex. The reaction for the formation of the dark red FeSCN2+ complex ion is very simple OBJECTIVES. The purpose of this lab is to experimentally determine the equilibrium constant‚ Kc‚ In this laboratory‚ we will determine the Equilibrium Constant for the reaction between the Ferric Ion (Fe3+) and the Thiocyanate Ion (SCN-) which produces Ferric Thiocyanate Ion (Fe(SCN)2+): Fe3+(aq) + SCN-(aq) Fe(SCN)2 (aq) MATERIALS 1. Cuvette 2. Pipet
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Daniel H. Perry Procedures of Measurement and Density of Sugar in Soda Introduction The main focus of this lab was to acquire a basic understanding of how to properly use measuring devices in order to determine properties of a liquid. These properties are volume‚ mass‚ and density. The following measurements were obtained in the lab: density of water‚ both density and concentration of aqueous sugar solutions‚ and density of various soft drinks with respect to sugar. Additional experience was
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Differential Staining Purpose: The purpose of this experiment was to become familiar with subtypes of culture media and the uses for each‚ learn and employ the streak and pour dish techniques‚ and generate a pure culture of a specific organism. Set Up: For this experiment I needed: 1 Distilled water‚ 1 Paper towels‚ 1 10%-bleach or 70% alcohol solution‚ 1 Zip bag‚ 1 Pan to heat agar‚ 1 Isopropyl alcohol (rubbing alcohol)‚ 1 Cultures: S. epidermidis and L. acidophilus‚ 1 Gloves‚ Disposable
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Purpose The purpose of this exercise is to learn aseptic technique procedures and there importance and also to learn to isolate colonies using the streak plate technique. Introduction Bacteria are inoculated (introduced) and cultured (grown) in the laboratory for test studies to determine their morphology (the shape‚ size‚ arrangement‚ and internal structures) and pathology (ability to cause disease). Inoculation has to be performed without adding other microbes or contaminants. Aseptic (sterile) technique
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compensation paid by laboratories to referring physicians and physician group practices (collectively‚ physicians) for blood specimen collection‚ processing‚ and packaging‚ and for submitting patient data to a registry or database. OIG has issued a number of guidance documents and advisory opinions addressing the general subject of remuneration offered and paid by laboratories to referring physicians‚ including the 1994 Special Fraud Alert on Arrangements for the Provision of Clinical Laboratory Services‚ the
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inevitably produced from the incomplete combustion of gasoline or coal that originates in industrial and agricultural processes1. PAHs are also water pollutants and may be found in water supplies across the United States2. Research conducted on laboratory animals exposed to low levels of PAHs have shown that the animals commonly develop various types of cancer and other harmful health effects. The
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