Spectrophotometry Of Cobalt Ii Chloride Results Enter Data Directly Into Lab Notebook 1a Absorbance Of Cocl2 Soluti 1 (178.16 KiB) Viewed 30 times
Spectrophotometry of Cobalt(II) Chloride Results: (Enter data directly into lab notebook) 1a: Absorbance of CoCl2 solution from 400 nm to 600 nm Wavelength Absorbance Wavelength Absorbance Wavelength Absorbance 400 nm 425 nm 0.124 450 nm 0.340 475 nm 0.660 0.563 10.366 500 nm $25 nm 0.720 0.122 01708 0.001 550 nm 600 nm 575 nm 1b: Additional absorbance around measured at 5 nm intervals Wavelength Absorbance Absorbance Wavelength Absorbance Wavelength u9oom 0.644 495nm 0.669 Sosnm 0.228 1c: Correct me sos 2. Absorbance at at of standard solutions for Beer's Calibration Curve, Absorbance Solution #: Concentration (M) of CoCl2 0.03 0.134 1 0.06 2 10.09 3 0.286 0.434 0.596 0.732 0.11 4 0.15 5 Show a sample calculation for CoCl, concentration (0.15M) (1.00ML) = M₂ (S mL) M2= 0.03 Smi COISM) (2.00mL): Me (SmL) Me 0.06 (0.15M) (3.00m2) = Me (5mL) Mz= 0.09 10.15M) (4.00 ML) = Me (5mL) = M2 = 0.12
4a. Unknown sample Identification Number or Letter: N 4b. Dilution and Absorbance of Unknown Solutions: Solution: Vol. of Unk (mL mL of H2O Absorbance [CoCl2], M 0.846 1 3 2 0.538 3 3 9.816 Show a sample calculation for [CoCl2] in diluted unknown solutions
3. Calculate the Beer's constant k (with unit) using the linear regression method, such that, ΣΑ, k (where c= concentration and A = absorbance) Σc (Provide a table for Ci, Ai, CịAi, and c;? for the calculation of Beer's constant.)
4c. Concentrations of CoCl2 in Undiluted Solution: Solution #: 1 2. 3 [CoCl2], M: Average concentration of CoCl2 (M): Show calculations to determine the concentration of CoCl2 in undiluted solution
If 15.0 mL of the solution prepared in No.1 (above) is diluted to 25.0 mL, what is the concentration of CoCl2 in the diluted solution? Calculate the absorbance of the diluted solution (in No.2) using the Beer's constant you obtained in this experiment.
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