ratio for EDTA binding with metals is O a. two are correct O b. all are correct O c. 1:1 for divalent metals o d. unstable complexation ratio with monovalent ions O e. 1:2 for tetravalent metals
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- Equations for the chemiluminescence determination of SO2 are given on page 383. Derive an expression for the relationship between the concentration of SO2 in a sample, the luminescence intensity, and the equilibrium constant for the first reaction.Nickel bis-dimethylglyoximate complex was deposited with a weight of (4.869g) with the filter paper from the base medium from adding (10ml) of hot DMG to a salt of nickel chloride at weight (0.78g), find the percentage of nickel ion. Note that the weight of the filter paper (1.30g). At.Wt.: Ni= 58.69 g/mol, C= 12 g/mol, O=16 g/mol, H=1 g/mol, N=14 g/mol(d) By using the data provided below, calculate the PillingBedworth ratio for the nickel (Ni) – nickel oxide (NiO) system and determine whether NiO is protective against corrosion. Atomic mass of nickel = 58.7 g.mol-1 Density of nickel = 8.91 Mg.m-3 Molecular mass of nickel oxide = 74.7 g.mol-1 Density of nickel oxide = 6.67 Mg.m-3 (e) A stainless steel pressure vessel that has fracture toughness, K1C, of 197 MN.m-3/2 is going to be exposed to a stress of 398 MN.m-2 . By using this information explain how designers can determine the thickness of the vessel so that catastrophic failure can be avoided.
- 5. Calculate the Ionic strength of solution prepared by mixing of 0.2 M NaNO3and 0.02M of K2Cr2O7:a) s = [Ksp / 27]1/5 b) s = Ksp1//5c) s = Ksp ½ d) s = [Ksp/108]1/5e) s = 108 Ksp(i) You have been provided with a sample collected from a water pool beside a slag heap at the iron ore mine. 35 uL of the sample is added to 1165 uL of buffered ferrozine (excess). If the %T recorded at 562 nm in a 2 mm cuvette is found to be 25%, calculate the concentration of Fe(II) in the sample in mol L−1 and ppm. Comment on the contamination level. (ii) Comment on a possible contaminant that could interfere with the assay and suggest an approach that could be used to account for its presence.Write down the defect chemistry equationfor introduction of SrTiO3 in BaTiO3using the Kröger-Vink notation.
- In the development o f an analytical method for the quantitative analysis o f iron using Atomic Absorption spectrophotometry (AAS), a linear calibration curve for standards o f 0.00, 5.00, 10.00, 15.00 and 20.00 ppm was prepared. An iron ore sample with an expected iron content o f 40-60% w/w is to be analysed by this method. An approximately 0.5-g sample is taken, dissolved in a minimum amount o f concentrated HC1 and diluted to 1 L in a volumetric flask using distilled water. A 5.00-mL aliquot is removed with a pipette. With explanation, to what volume (10, 25, 50, 100, 250 500 or 1000 mL) should the 5.00 mL aliquot be diluted, to minimize the uncertainty in the analysis?Nickel bis-dimethylglyoximate complex was deposited with a weight of (2.721g) with the filter paper from the base medium from adding (10ml) of hot DMG to a salt of nickel chloride at weight (0.4g), find the percentage of nickel ion. Note that the weight of the filter paper (0.78g).The accompanying data (1.00-cm cells) were obtained for the spectrophotometric titration 10.00 mL of Pd(II) with 2.44 10-4 M Nitroso R(O. W Rollins and M. M. Oldham, Anal. chem .,1971, 43, 262, DOI: 10.1021/ac60297a026). Calculate the concentration of the Pd(II) solution, given that the ligand-to-cation ratio in the colored product is 2:1