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- 1. Define: spectrochemical methods, spectroscopy, spectrometry, spectrometer, and spectrophotometer. 2. What is specific about the general analytical strategy for spectrochemical analysis methods comparedto instrumental analysis in general? 3. What is meant by the dual nature of light?Briefly compare the advantages and disadvantages of Nujol mulls and KBr pellets for the analysis of solid samples by IR spectrometry.An aqueous solution of sodium hexaiodoplatinate(IV) isblack. What conclusions can be drawn about the absorption spectrum of the [PtI6]2- complex ion?
- A green solution containing Ni+2 ions absorbs 580 nm light. Undiluted, a sample of this solution sampled in a 1.00 cm diameter cuvette has an absorbance of 0.9765 a.u.. If the molar absorptivity coefficient for Ni+2 is 6.3 x 104 M -1 cm -1 at 580 nm, how much of the original stock Ni+2 solution (in mL) needs to be added to water to create a total dilute solution volume of 10.00 mL that measures an absorbance of 0.146 a.u. at 580 nm? Report your answer to 3 significant figures. Do not include the "mL' unit label in your responseThe molar absorptivity (ε) of the FeSCN2+ complex ion is 4700 M-1 · cm-1 at a wavelength of 450 nm. Using a 1-cm sample tube, you measure the absorbance as (2.0x10-1). What is the concentration of FeSCN2+? What is your answer? _____________x10^_____Explain how to obtain larger particles based on the relative supersaturation
- What is the fragment for the base peak at m/z = 29? Deduce and explain the halogen present in the compound. Hence, identify compound B. Suggest why the two peaks at m/z =108 and 110 have almost the same intensity? (Relative atomic masses: F = 19.0, Cl = 35.5, Br = 79.9, I = 126.9)K 32 Uses a lamp and a flame for determining the concentrations of metal ions in solutions. a. High performance liquid chromatography b. gas chromatography c. mass spectrometry d. infrared spectroscopy e. UV/VIS spectroscopy f. atomic absorption spectroscopy g. thin layer chromatography5. What is the working principle of raman spectroscopy.?6. Compare atomic spectroscopy with moleculer spectroscopy. Show also the electronic transitions and spectra of both methods.?7. What are the names of the elements that we can not analyse with AAS but we can use ICP-OES for quantitative analysis.?
- The accuracy of a spectrophotometer can be evaluated by preparing a solution of 60.06-ppm K2Cr2O7 in 0.0050 M H2SO4 and measuring its absorbance at a wavelength of 350 nm using a cell with a pathlength of 1.00 cm. The absorbance should be 0.640. What is the molar absorptivity of K2Cr2O7 at this wavelength?Explain the meaning of the following terms and phrases: 1.1 Precision of a set of results. 1.2 Noise around an analytical signal. 1.3 A shelf-life of an aqueous trace metal standardAtomic absorption spectroscopy with graphite furnace atomization is an extremely sensitive technique. The standard addition method is used with this technique to determine the concentration of copper in urine. A 20.00 mL sample of urine is spiked with 1.00 mL of 300. ppb Cu²+ and this mixture gives a response of 0.168. Another 1.00 mL aliquot of 300. ppb Cu²+ is added to this mixture and gives a reading of 0.235Determine the concentration of copper in the urine sample
