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- What is the difference between a primary and a secondary standard? Give an example of each.Explain the differences between the following calibration methods and why they are needed. a) External standard; b) Standard addition; c) Internal standard1a. List THREE (3) advantages of internal standardization method than normal calibration.
- [References) A method for the determination of the corticosteroid methylprednisolone acetate in solutions obtained from pharmaceutical preparations yielded a mean value of 3.7 mg mL with a standard deviation of 0.3 mg mL. For quality control purposes, the relative uncertainty in the concentration should be no more than 3%. How many samples of each batch should be analyzed to ensure that the relative standard deviation does not exceed 9% at the 95% confidence level? samplesRelate the following terms: Calibration, Reference Material, and Chemical Standard. *Q3. A cellulose coating that weighs at least 3.00 mg is often applied to the exterior of vitamin C tablets in order to delay the release of active ingredients. A random sampling of 100 vitamin tablets revealed that 6 vitamin tablets failed to meet the required weight of the cellulose coating. (а) Calculate the relative standard deviation (in %). (b) Determine the number of tablets should be taken into consideration to ensure a relative standard deviation of 15 %.
- Categorize each as a determinate or an indeterminate error and further classify determinate errors as instrumental, method or personal. a) An unknown sample being weighed is hygroscopic. b) One component of a mixture being analyzed quantitatively by GC reacts with the column packing. c) A radioactive sample being counted repeatedly without any change in condition yields a slightly different count at each trial. d) The tip of the pipet used in the analysis is broken. e) In measuring the same peak heights of a chromatogram, two technician each report different heights.This question is not an accredited questionif we want to prepare acertizen tablet each tablet contain 10mg of drug and the equation for calibration curve of acertizen is y= 0.035x + 0.0148 absorbance 1 = 0.323 absorbance 2 = 0.406 the concentration of drug in absorbance 2 in mg /900ml Choose... + the percentage of drug Choose... release in abs2 the percentage of drug release in abs1 Choose... + the concentration of Choose... + absorbance 1 in mg /900ml the concentration of absorbance 2 in microgram Choose... /ml