Beers law plot the burets were used to measure 1ml

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Beer’s Law Plot: The burets were used to measure 1mL 0.1M CuSO4 and 5mL 2.5M NH3 into a 50mL graduated cylinder. The volume was brought to 50mL with distilled water. The solution was put into a beaker and stirred thorough thoroughly. The solution was placed in a cuvette, and the absorbance was measured and recorded at 600 mµ. The instrument was standardized before taking the reading. The procedure was repeated using 2, 3, 4, 5, 6, 7, 8, 9, and l0 mL of 0.1 M CuSO4 solution, 5mL of 2.5M NH, solution and enough water to make 50mL of solution. The absorbance of each solution was measured and recorded. The change in intensity of color as the solutions become more concentrated was observed. A Beer's Law Plot was constructed by hand and using Excel from the data and ε1 was calculated for Cu(NH3)42+. Determination of an Unknown Solution: A solution of Cu(NH3)42+ of unknown molarity was obtained from the instructor. The unknown solution was placed in a cuvette and the absorbance of the unknown solution was measured and recorded at 600 mµ. The instrument was blanked before taking the reading. The Beer's Law plot that was constructed the molarity of the unknown Cu(NH3)42+ solution was determined to the appropriate significant figures.
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Pre Lab Experiment #11 Jacqueline Galibova 11/15/17 Purpose: The purpose of this experiment is to use a spectroscope to observe the emission spectra of several elements. Atomic Spectra and Atomic Structure: A spectroscope was obtained from the stockroom. Lamp observations were made easier when the lights were turned off. The lamp was plugged in. It was turned on. The tube itself was not touched. The spectroscope was pointed as the lamp so that the slit lined up with the lamp tube. A series of 3 or 4 lines was seen. The color was recorded as well as the numerical reading for each line that was seen to the nearest 0.01. Mercury lamp: The lamp was plugged in. It was turned on. The tube itself was not touched. The spectroscope was pointed as the lamp so that the slit lined up with the lamp tube. The color and wavelength of each line that was seen was recorded to the nearest 0.01. Flame tests: 5mL of 0.1M NaCl solution was obtained in a clean and dry test tube. The same was done for each of the remaining solutions, KCl, CaCl , BaCl , and an unknown. 5mL of each solution was placed into separate test tubes. The wire loop was dipped into the NaCl solution and placed in the hottest part of the Bunsen burner flame. It was observed and the color of the flame was recorded. The wire was then dipped into the HCl solution and it was burned off in the flame to clean the wire. The steps were repeated for the other solutions and for the unknown. The identity of the unknown was determined by comparing the colors that were observed with those of the known solutions. The data was used along with the Balmer equation to determine a value for R H.
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g Pre Lab Experiment #10 Jacqueline Galibova 11/08/17 Purpose: The purpose of this experiment is to find a chemical reaction and measure the thermochemistry by calculating heat change.
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