A 0.10 µM aqueous solution of a metal ion, M2+, is extracted into an organic solvent by 0.43 mM of the ligand L¯. Given that KL = 1.2 x 104, KM = 6.0 × 10*, Ka = 3.0 x 10-5, Bn = 5.0 x 1022, and n = 2, calculate the distribution ratio, D, for the extraction at pH 1.50 and at pH 4.00. DpH=1.50 = DpH=4.00 =
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- Mixing the chelating reagent B with Ni(II) forms the highly colored NiB22+, whose solutions obey Beer’s lawat 395 nm overa wide range. Provided the analytical concentration of the chelating reagent exceeds that of Ni(II) by a factor of 5 (or more), the cation exists, within the limits of observation, entirely in the form of the complex. Use the accompanying data to evaluate the formation constant Kf for the process Ni2++2BNiB22+A 5.07-g petroleum specimen was decomposed by wet ashing and subsequently diluted to 500. mL in a volumetric flask. Cobalt was determined by treating 25.00-mL aliquots of this diluted solution as follows: Reagent Volume in mL Co(II), 3.00 ppm Ligand H2O Absorbance 0.00 20.00 5.00 0.416 5.00 20.00 0.00 0.522 Assume that the /ligand chelate obeys Beer’s law and calculate the percentage of cobalt in the original sample.Calculate for the molar absorptivity coefficient of a 0.55 microgram per liter Cr(III) chelate solution that exhibits an absorbance of 0.9765 at 590 nm measured in a 1.00 cm cell.
- 1.A compound Y (150.0 g/mol) in a 1.00 cm quartz cell has an extinction coefficient (ε) of 23,150 at λmax=235 nm. What is the energy absorbed by the compound at the maximum of the peak? Note that hc=1.98644586×10−25J*m. Report your answer in KJ/mole to the correct number of significant figures. Do not include the units in your answer 2.In general, we want to have absortions less than or equal to 1. What percentage of the incident light is transmitted when absorption is 1? Report your answer to the nearest whole number. 3.An ethanol solution of 3.5 mg/100 ml of compound Y (150.0 g/mol) in a 1.00 cm quartz cell has an absorbance (A) of 0.972 at λmax=235 nm. What is its molar extinction coefficient? Report your answer to the correct number of significant figures.Predict whether the following complexes would show Jahn-Teller distortion: Ammonium pentachlorooxidochromate(V), meff = 1.8 mB Potassium hexaiodidomanganate(IV), meff = 3.8 mB Potassium hexachoridocuprate(II), meff = 1.8 mB Hexaaquamanganese(II) chloride, meff = 6.0 mBExplain why ionic attractions are weaker in media with high dielectric constants, e. g.,water and aqueous buffers.
- A 0.9352g sample of ore containing Fe³+, Al³+ and Sr²+ was dissolved and made up to 500.00 mL. The analysis of metals was performed using complexation volumetry. Initially, an aliquot of 50.00 mL had its pH adjusted to 1.0 and titrated with a standard 0.03145 mol/L EDTA solution, requiring 6.95 mL to reach the end point. Subsequently, another 25.00 mL aliquot was buffered at pH=5 and titrated with the same EDTA solution, requiring 6.24 mL to reach the end point. Finally, a third aliquot of 25.00 mL was titrated at pH=11, requiring 11.10 mL of the same EDTA solution to complete the titration. Given the molar masses: Fe=55.845 g/mol; Al-26.982 g/mol and Sr-87.620 g/mol. a) Determine the percentage of each of the metals in the sample. b) Explain why the change in pH allows the determination of the three ions in this sample.In general, we want to have absorptions less than or equal to 1. Given that an ethanol solution of compound Y (150.0 g/mol) in a 1.00 cm quartz cell has an extinction coefficient (ε) of 23,150 at λmax=235 nm, what is the top concentration, in μM, we should consider for compound Y? Report your answer to the correct number of significant figures. Do not report the units in your answer.Aluminium (III) reacts with the Chelating agent HL to give a complex AlL3 that is readily soluble in CHCl3. A spectrophotometric study shows that when a 1.77 x10-4 M aqueous solution of aluminium was extracted with CHCl3 containing 0.01M HL, the analytical concentration of aluminium at pH 4.5 in the two phases were 1.5 x 10-4 M [Al3+]upper) and 2.73 x10-5 M ([AlL3]lower) . What is the distribution coefficient at pH 4.8.
- The absorbance of a 0.00105% m/v solution of tolbutamide in methanol when measured in a 1 cm path length cell was found to be 0.796 at 228 nm. Calculate the specific absorbance.The absorbance values observed during the determination of the complex stoichiometry with the Job method using the spectroscopic method were plotted and the following correct equations were obtained. According to this, what is the n value of the compound formed by Fe + 3 and SCN- ions?1. Line equation: y = 2.6188x + 0.1608 2. Line equation: y = -2.5963x + 2.7203A. Consider three possible ways in which Cu2+ could sorb to a hematite surface: (1) outer-sphere sorption, (2) inner-sphere sorption, and (3) precipitation as a Cu(II)-hydroxide. Describe the differences in the coordination environment - i.e. identify of the nearest atomic neighbours and interatomic distance within 0.5 nm (5 Å) of a given Cu(II) ion - of each sorption process. You are welcome to draw a schematic illustration to help clarify your text.