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- A chemist received a radioactive sample that is suspected to contain U, 23U and other elements. The authority wants to know the distribution, qualitative and quantitative composition of the sample. Propose with justifications, ONE Surface analysis technique that can be performed on this sample.What application of CHNS elemental analysers can be suggested in Food Analysis Give examples for it and explain its importanceCompare and contrast an anticipatory standard to a reactionary standard by listing and describing some advantages and disadvantages.
- The student was supposed to measure the pH of a 0.1 M hydrochloric acid solution. For this purpose, he used a pH-meter and obtained the following results: 0.90, 0.93, 1.04, 1.02. Present the appropriate graphic and statistical elaboration of the performed analysis and confirm whether the applied pH-meter worked properly.The partition coefficient of ammonia between water and chloroform is wanted to be determined. The necessary quantities of ingredients are taken into the separation funnel, and the extraction process is applied. At the end of the extraction process, 5 mL portions of each of the water and chloroform phases are titrated with 0.1 M HCI in the presence of methyl orange indicator. If the volumes spent at the turning points are 7.2 and 5.1 mL, respectively, calculate the KSU, KLOROFORM (Dispersion coefficient) value.This method is to be used when measuring the volume of a solution containing sufficient reagent to react completely with the analyte. Group of answer choices Volumetric Spectroscopic Gravimetric Electroanalytical
- Briefly explain method validation in analytical chemistry? Discuss typical validation characteristics which could be considered. Name some international organisations offering guidelines on method validation(a) In High Performance Liquid Chromatography (HPLC), the separation method is by partition of the solute (analyte) between the mobile phase and the stationary phase. Explain how this leads to separation of analyte mixtures; (b) Describe the structure and materials use in a typical column used for HPLC. Thereby explain why high pressures have to be used in HPLC; (c) Discuss how the need for high pressures also imposes requirements on the injector;3. The precipitate in a gravimetric method for sulfate weighed 622.7 mg of which 13.6 mg was a contaminant, Fe.(SO,),. (a) What would the precipitate weigh if all of the sulfate was present as BaSO,? (b) What will the precipitate weigh after ignition at 800 °C? (c) What is the relative error (in percent) in the ignited precipitate due to the fact that some of the sulfate precipitated as Fe.(SO,), rather than BaSO,?
- This method is to be used when measuring the volume of a solution containing sufficient reagent to react completely with the analyte. Volumetric O Spectroscopic Gravimetric ElectroanalyticalIn a sample digested with phosphoric acid, it was found that analysis of calcium reflects less sensitivity than when digestion is done with hydrochloric acid. Explain.Analytical Chemistry Describe the formation of plasma and its functions in ICP-MS technique