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- Ca(QCI)2 + 2 CH3COOH E-> 2HOCI + (CH3COO)2Ca|Why is Fe2+ used asan electron donor chiefly in acidic environments?25.0 g of an impure sample containing cobalt was dissolved in acid and diluted to1000.00 mL. 6.00 mL of this sample was removed, treated appropriately to give a coloredsolution, and then diluted to 250.00 mL. This final solution had an absorbance of 0.410.Calculate the percentage of cobalt (MW = 58.93 g/mol) in the original sample.
- A standard iron solution was prepared by dissolving 0.0140 g of pure iron in acid then transferring to a 50.00 mL volumetric flask with orthophenanthroline as a complexing agent. At a wavelength of 540 nm, the absorbance of the standard was 0.214 in a 1.00 cm cuvette. A 0.128 g sample of an iron ore was crushed and digested in 5 mL of concentrated acid. The digested sample was then transferred to a 10.00 mL volumetric flask and diluted to the mark with water. A 1.00 mL aliquot of the sample was transferred to a 25.00 mL volumetric flask, and diluted to the mark with water. A portion of the diluted sample was then transferred to a 1.00 cm cuvette and measured at a wavelength of 540 nm. The resulting absorbance was 0.216. Determine the % w/w of Fe in the iron ore.What wavelength is the peak absorbance of CoCl2?What is the concentration of a tyrosine solution when the absorbance at 280 nm is 1.5 using a 1 cm cuvette and the molar extinction coefficient is 1405 L/mol·cm?
- Q4(ii)A solution of FeSCN2+ has an absorbance of 0.237. What is its concentration? 0.19 M 0.47 M 0.24 M 0.80 M 0.65 M4. A solution containing complexes of Bi (III) and thiourea has a molar absorptivity of 9.32 x 103 L/cm.M at 470 nm. Calculate the absorbance of a 6.24 x 10-5 M solution in a 1.00 cm cell. 58.15 x 10-2 5.815 x 109 1.494 x 108 O 5.815 x 10-7
- 20. In current-sampled polarography the polarographic wave of which metal ion will appear first? Pb (E% = -0.4 V) Cd (E% - -0.6 V) O Zn (E% = -1.0 V) Cu (E% - +0.02 V)Consider the spectrum of (Co(H20)6]** in aqueous solution below and answer the questions that follow: 0.14 0.12 0.1 0.08 0.06 0.04 0.02 Wavenumber em A = 18,000 cm B = 27,000 cm (a) Use the appropriate Tanabe-Sugano diagram to assign the absorbance bands in the spectrum above. (b) Which transition is not observed in the spectrum? Suggest a reason why only two absorption bands are observed. (c) Determine the B Racah parameter. Show all calculations. (d) Determine the Ao parameter. Show all calculations. AbsorbanceR 400m N CO₂tBu OH CO₂Me Ph LDA THF, -78 °C silica gel 6 days room temperature R MeO₂C NCO₂Bu CHO CO,Me I + H₂O