i) ii) Which metals is classified as a Group 2 cations? What is the selective reagent for Group 2 and How was produced this selective agent as in situ in the experiment?
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- (i) What type of non-stoichiometric point defect is responsible for the pink colour of LiCl?(ii) What type of stoichiometric defect is shown by NaCl?How anodic stripping voltammetry works for analysis of chromate. How is the analytical signal generated?Which of the following statements is true regarding the iron-phenanthroline method? I. Any wavelength of radiation can be utilized with no change in the results. II. Blank correction must be performed to account for any absorbing species other than the analyte in the solution. III. This method can be used to discriminate and quantify the Fe3+ and Fe2+ content in the sample. II and III I and II III only II only
- Which of the elements go into complete addition solution (space positions or interstitial) with Ni?a. An iron ore has a 55% Fe2O3 with 5% moisture content. What is the Percentage of Fe2O3 in a dry basis? b. An iron ore has a 55% Fe2O3 with 5% moisture content. What is the Percentage of Iron in a dry basis?What types of metals are usually purified by the method of zone refining? Give an example.
- You wish to measure the iron content of the well water on the new property you are about to buy. You prepare a reference standard Fe3+ solution with a concentration of 5.74×10−4 M. You treat 14.0 mL of this reference with HNO3 and excess KSCN to form a red complex and dilute the reference to 60.0 mL. The diluted reference is placed in a cell with a 1.00‑cm light path. You then take 30.0 mL of the well water, treat with HNO3 and excess KSCN, and dilute to 100.0 mL. This diluted sample is placed in a variable pathlength cell. The absorbance of the reference and the sample solutions match when the pathlength is 1.76 cm. What is the concentration of iron in the well water? For each solution, the zero is set with a blank.You wish to measure the iron content of the well water on the new property you are about to buy. You prepare a reference standard Fe3+ solution with a concentration of 5.53×10−4 M. You treat 10.0 mL of this reference with HNO3 and excess KSCN to form a red complex and dilute the reference to 45.0 mL. The diluted reference is placed in a cell with a 1.00‑cm light path. You then take 20.0 mL of the well water, treat with HNO3 and excess KSCN, and dilute to 100.0 mL. This diluted sample is placed in a variable pathlength cell. The absorbance of the reference and the sample solutions match when the pathlength is 3.25cm. What is the concentration of iron in the well water? For each solution, the zero is set with a blank.b. Given that the cuvette path length was 1.17 cm, use the slope of this line to calculate the molar absorptivity of the cobalt complex at this wavelength. (Assume Beer’s law is obeyed.) c. An unknown cobalt sample was treated as follows: 40.8 mg of the unknown was dissolved in solvent to prepare 50.00 mL of solution in a volumetric flask. 4.00 mL of this solution was treated with thiocyanate, and diluted to a final volume of 50.00 mL. A sample of this final solution was placed in the same cuvette as the standards, and showed an absorbance of 0.38 at 625 nm. Determine the percentage of cobalt in the original unknown, given that the atomic mass of cobalt is 58.933 g/mol.
- Answer the following :(i) What is the role of cryolite in the metallurgy of aluminium?(ii) Difference between roasting and calcination.(iii) What is meant by the term ‘chromatography’?Mesityl oxide shows two bands at 230 nm and 327 nm .But its isomer does not show any bands above 210 mm .Explain.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.