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- How do you weigh hydgroscopic samples?
2. How do you analyze a sample in “weight basis” or as received basis”?
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- What are the types of gravimetric methods? Give an examples where each method is used in an analysis. What is particulate gravimetry? When do we use this technique?What are the advantages and disadvantages of volumetric and gravimetric analysis?What are the types of gravimetric methods? Give an examples where each method is used in an analysis.
- A 2.0 g of MgCO3 was dissolved and diluted to exactly 500-mL volumetric flask. If 50-mL aliquot was used in the analysis, what is the weight of MgCO3 present in the aliquot sample2. What is the basis for the separation of components of mixtures by paperchromatography?Can you use chromatography to purify a mixture? Why?
- how to use Gas Chromatography in Cosmetics Provide a procedure on how to do this example that you provided. Explain the procedure and what data would you gather?ASSAY Calibration solutions Calibration solutions of naproxen in the range 5 – 25 μg/mL were prepared. Sample preparation 20 tablets weighing 12.3819 g were crushed to a fine powder. A portion of the powder (145.4 mg) was shaken with approximately 150 mL of acetic acid (0.05 M) for 5 min and then made up to volume in a 250 mL volumetric flask (stock solution). Approximately 50 mL of the stock solution was filtered and a 25 mL aliquot was diluted to 100 mL in a volumetric flask. 10 mL of the resulting solution was further diluted to 100 mL with acetic acid (0.05 M). Analysis The standards and sample solutions were analyzed by HPLC under the following conditions: Column: octadecylsilyl (ODS), 4.6 mmx150 mm, mobile phase: acetonitrile : 0.05 M acetic acid (85:15), flow rate: 1 ml/min, UV detection at 243 nm. Results: A calibration curve of concentration versus peak area was constructed for the standard solutions and gave the straight-line equation: y = 3555.6x + 85, r = 0.9999 The area…4. A fat sample with combination of acids contain standard hydrochloric acid for blank and sample with 8mL and 5mL respectively. The normality of the standard hydrochloric acid is 0.93N and the weight of the sample is 3 grams. Calculate the saponification value.
- Chromatography question A student properly sets up a column chromatography experiment. Although the mixture is soluble i the mobile phase, the sample appears "stuck" at the top of the column and will not elute eregardless of how much solvet is pplaied. what could bee the cause of this issue and what could teh student try to achieve a successful separation?3. What is particulate gravimetry? When do we use this technique? 4. What are the conditions for a successful gravimetric analysis. 5. Define nucleation. What conditions are important for this stage.Can paper chromatography be used to separate and identify very volatile substances? Why? Please explain comprehensively.