Formal Research laboratory Report Design template 357 Dissertation

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Spectrophotometric Determination of Copper in Brass

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Chemistry 1290-xxx

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Purpose:

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In this lab nitric acid to be used as an oxidizing agent and (NO2) nitrogen dioxide will contact form. This gas is extremely dangerous, and should not be inhaled. A use of a blow a gasket hood must be used during the process of adding nitric chemical p (HNO3) towards the solution. Additionally , safety goggles should be worn throughout the complete lab. Sneakers should be closed toed, garments should cover legs right down to the shoes with socks, and shoulders should be covered by t shirts. Hair has to be tied backside. Caution should be taken during this lab, of course, if it appears that the fumes from your nitrogen dioxide (NO2) are not being taken off by the fume hood, a trainer must be advised while the student stops adding the concentrated nitric acid solution (HNO3). It is additionally possible to stain the hands of those working with these types of chemicals, therefore extreme care when transferring solutions that might be highly acidic is essential.

Materials:

protection goggles

spectrophotometer

computer with SpectroPro software

forceps

paper towels

polish pencil

copper wire

steel wool

analytical balance

brass test to be tested

80 mLtest tube

250 mL Erlenmeyer flask

50 mL graduated cylinder

250 milliliters beaker

2 hundred mL beaker

250 cubic centimeters volumetric flask

volumetric pipettes (10mL, 25mL, and 50mL)

four 75 mL volumetric flasks

two hundred fifty mL volumetric flask

pipette bulb

Chemical compounds:

0. 2% nitric Acid solution, HNO3approximately 40 mL every sample

targeted nitric Acidity, HNO3approximately 60 mL every sample deionized water, H2Oapproximately 75 cubic centimeters per test

tap water, H2Oapproximately 100 milliliters per sample

Process:

During this laboratory the student started up and heated up the spectrophotometer and set the laptop computer program the program Spectro Pro jogging. The student after that obtained the mandatory materials found in this research laboratory and commenced the techniques. The student cleansed the test tubes with nitric acid (HNO3, 0. 2%). One check tube was then packed half total with the same solution of nitric acid and easily wiped clean of finger prints and smudges. This sample was used as a empty to set the zero absorbance for the spectrophotometer. The direction from the test pipe was proclaimed and observed for foreseeable future use. The student then selected a New Absorbance vs . Focus experiment in SpectroPro. It was done in so that it will calibrate the spectrophotometer. The wavelength environment was dress the spectrophotometer at 620nm and the machine was established absorbance, shown as device (A). The student set the blank to zero absorbance and finished the adjusted of the spectrophotometer. The solution in the test tube was after that discarded and the test tube was put aside. Copper line was obtained, weighed and cut to approximately 2 . 5 g, and then cleaned out with stainlesss steel wool. The copper was then dealt with with forceps, and wrapped tightly in regards to pencil. The copper was set aside to prepare the solution found in this try things out. The student put approximately 100 mL of cold plain tap water in a 250mL Erlenmeyer flask. 50 mL of centered nitric acid solution was tested in a managed to graduate cylinder, 20 mL that was transferred to the 80mL test conduit. This test out tube was placed in the Erlenmeyer flask with enough water protecting at least 2 centimeter of the evaluation tube. The coiled water piping wire via earlier was cautiously placed into the test pipe. The fume hood was lowered to stop any breathing of the harmful gas provided from the exothermic reaction. The rest of the nitric acid solution (HNO3) was slowly added during the dissipating of the copper wire. Roughly 75 cubic centimeters of deionized water was poured in a 250 mL beaker. The nitric acidity solution was transferred in the 80mL test tube to...

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