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The following can affect the stability of samples except for:
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- For this statement, answer True or False and explain your answer briefly. Polarity is the only characteristic used in liquid-liquid extraction to isolate a poison from the biological matrix.What constitutes a 'reference material', and why does its utilization play a criticalrole in the chemical analysis of food products? Provide examples.What is the function of a desiccant in a set-up of volatilization gravimetry? To remove nitrogen from the sample To remove sulfuric acid from the sample To remove water vapor from the sample To remove carbon dioxide from the sample
- Which activities are likely to cause contamination of stock chemicals in the laboratory?In each of the following situations, what type of filtration device would youuse? (Do not consider centrifugation when answering this question.)a. Remove powdered decolorizing charcoal from 20 mL of solutionb. Collect crystals obtained from crystallizing a substance from about 1 mL of solutionc. Remove a very small amount of dirt from 1 mL of liquidd. Isolate 0.2 g of crystals from about 5 mL of solution after performing acrystallizatione. Remove dissolved colored impurities from about 3 mL of solutionf. Remove solid impurities from 5 mL of liquid at room temperatureA batch of raw milk was tested and found to contain a bacterial population of 8xl06cfu/ml. It is to be pasteurised at noc for 33 seconds. The average D value at 52°C for the mixed population is 11 min. The z value is 10°C.i)Explain the terms "D value" and "z value".ii)Calculate how many organisms will be left after pasteurisation.iii)Hpw much time will be needed at 62°C to accomplish the same degree oflethality?iv. How much time will be needed at 82°C to achieve the same degree oflethality?
- Discuss the differences between the following terms and describe briefly the corresponding application(s) in food analysis and characterization: (a.) Acid value and saponification value; (b.) Peroxide value and totox value; (c.) Dialysis and ultrafiltration; (d.) Thermogravimetric analysis and differential scanning calorimetry; (e.) Munsell system and CIE tristimulus system.Determine each statement if it describes dissolution or disintegration. It is mainly affected by tablet hardness, presence of binders and fillers. The process of breaking down a substance that is not readily soluble May apply on solid, liquid and gaseous dosage forms. The process of breaking down a substance into tiny fragments. Involves the interaction between solute and solvent. Heat will majorly make the process faster The process closer to the absorption process. Tested using a machine with a basket rack holding six plastic tubes. The test for this process requires the sample to be tested for concentration of active ingredient over time. Usually only applies to solid dosage forms.For each of the following statements, answer True or False and explain your answer briefly. It is preferred to apply colour tests, as a screening test, over microcrystalline tests in drug analysis.
- Draw a schematic diagram using this information. Preparation of the solution Take about 25-30 ml of distilled water in a beaker and add powdered crude copper sulphate while stirring the solution so that the powder dissolves. Keep adding the powdered sample till a little of it remains undissolved, even if it is stirred thoroughly. Now add 2-3 ml of dil. H2SO4 to make the solution clear. This prevents the hydrolysis of copper sulphate. Filtration of the solution Take a funnel and fix a filter paper in it and clamp it to a stand. Place a china dish under the funnel. The stem of the funnel should touch the wall of the china dish to avoid the solution splashing out. Pour the solution into the funnel over a glass rod and collect the filtrate in a china dish. The insoluble impurities are left in the filter paper as residue. Concentration of the filtrate to crystallisation point Heat the china dish on a sand bath till the solution is reduced to about one-third of its original volume. To…Why is water not used as a solvent in extraction of nutsKsp of silver phosphate Ag3PO4 = 1.3 x 10-20
