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What are the analyses or instruments that are used to verify or confirm if the extracted substance is indeed caffeine?
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- 5. What criterion is used for the purity of a sample of caffeine?Oral rehydration salts are stated to contain the following components: Sodium Chloride 3.5g Potassium Chloride 1.5g Sodium Citrate 2.9g Anhydrous Glucose 20.0g 8.342 g of oral rehydration salts are dissolved in 500 ml of water. 5 ml of the solution is diluted to 100 ml and then 5 ml is taken from the diluted sample and is diluted to 100 ml. The sodium content of the sample is then determined by flame photometry. The sodium salts used to prepare the mixture were: Trisodium citrate hydrate (C6H5Na3O7, 2H2O) MW 294.1 and sodium chloride (NaCl) NW 58.5. Atomic weight of Na = 23. The content of Na in the diluted sample was determined to be 0.3210 mg/100 ml. Determine the % of stated content of Na in the sample. The stated should be 104.5, how??Oral rehydration salts are stated to contain the following components: Sodium Chloride 3.5g Potassium Chloride 1.5g Sodium Citrate 2.9g Anhydrous Glucose 20.0g 8.342 g of oral rehydration salts are dissolved in 500 ml of water. 5 ml of the solution is diluted to 100 ml and then 5 ml is taken from the diluted sample and is diluted to 100 ml. The sodium content of the sample is then determined by flame photometry. The sodium salts used to prepare the mixture were: Trisodium citrate hydrate (C6H5Na3O7, 2H2O) MW 294.1 and sodium chloride (NaCl) NW 58.5. Atomic weight of Na = 23. The content of Na in the diluted sample was determined to be 0.3210 mg/100 ml. Determine the % of stated content of Na in the sample.
- Upon screening with TLC (made of silica gel) chromatography using hexane/chloroform (3:1) as eluting solution, 3 spots were detected corresponding to a (A) polyphenol, a (B) tannin and an (C) alkaloid. Write the letters of the on the spots in the chromatogram shown at the right.. Given the following drugs in a urine specimen: Cocaine alkaloid Secobarbital (a derivative of barbituric acid) Carisoprodol (a neutral drug) Devise an analytical flow chart that will be used to separate these substances from a urine specimen. The separation will be liquid extraction methods. Choose appropriate solvents and reagents based on the properties of the materials to be separated.Upon screening with TLC (made of silica gel) chromatography using hexane/chloroform (3:1) as eluting solution, 3 spots were detected corresponding to a (A) polyphenol, a (B) tannin and an (C) alkaloid. Write the letters of your answers on the spots in the chromatogram shown at the right.
- A sample of naphthalene is contamined with a small amount of anthracene. The melting point would be about the sample as the pure sample higher and the range broader than the pure sample lower and the range more narrow than the pure sample lower and the range broader than the pure sample higher and the range more narrow than the pure sampleWhich criterion is used for the purity of a sample of caffeine? Why is this criterion used instead of Murexide test?The following chromatogram was the output of the analysis of phytosterols in plants by gas chromatography. Cholesterol Campesterol Stigmasterol Brassicasterel osteral 16.5 17.0 17.5 18.0 18.5 Min From the chromatogram which compound had the lowest boiling point? A Campesterol B Stigmasterol Cholesterol
- An enzymatic method for determining alcohol in the wine is evaluated by comparison with a gas-chromatography (GC) method. The same sample is analyzed several times by both methods with the following results (% ethanol). The values of alcohol for both enzymatic and GC methods are shown in Table 1. Using a suitable test, determine whether the enzymatic method gives the same value as the GC method at 95% confidence level.this is for the Extraction and Isolation of Caffeine from coffee lab1) Outline the processes you would adopt to purity and test the purity of sodium benzoate, an active ingredient of most cosmetic products in the laboratory.