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chem lab exp. 7 (ii)

chem lab exp. 7 (ii) - 610 43.2 0.304 Part II Determination...

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Purpose : To determine the wavelength of maximum absorbance for a variety of solutions, and then determine the concentration of an unknown through use of the Beer – Lambert Law. Procedure : The procedure of the experiment is referred to the lab manual on Experiment #7 – Visible Spectroscopy. Data Tables: Table 1: Part 1: Absorbance vs. Wavelength Wavelength, λ nm %T Absorbance, A Solution 1 495 32.6 0.486 505 32.0 0.494 515 31.8 0.498 525 32.6 0.488 535 36.2 0.440 545 45.4 0.342 Solution 2 610 40.6 0.392 620 30.0 0.522 630 23.8 0.624 640 28.4 0.548 650 44.4 0.353 Solution 3 435 29.6 0.528 445 30.0 0.522 455 31.2 0.508 465 33.4 0.476 475 36.8 0.434 485 42.6 0.371 Solution 4 600 82.4 0.084 610 78.4 0.104 620 73.8 0.133 630 69.0 0.161 640 60.0 0.222
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650 64.2 0.193 Solution 5 560 82.6 0.083 570 74.4 0.129 580 66.8 0.175 590 57.6 0.239 600 28.4 0.548
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Unformatted text preview: 610 43.2 0.304 Part II : Determination 1 : Molarity of NH 3 (aq) solution _______________ Table 2: Absorbance of Cu(NH 3 ) 4 2+ solutions Solution mL M of Cu(NH 3 ) 4 2+ %T Absorbance, A 1 1mL 0.004 67.0 0.174 2 2mL 0.008 46.5 0.333 3 3mL 0.012 30.5 0.516 4 4mL 0.016 21.0 0.678 5 5mL 0.020 15.5 0.810 Part II: Determination 4: Slope of absorbance vs. concentration graph εb= ________________ Table 3: Part III: Concentration of Analyte Unknown # 7/213 Trial %T Absorbance, A C = A/εb Mol/L M of analyte 1 67.4 0.688 2 65.8 0.678 3 66.0 0.678 4 67.0 0.688 Average [Cu 2+ ] = _______________ Std. Dev. [Cu 2+ ] = _______________ 95% CI for [Cu 2+ ] = _______________...
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