Is sodium propanoate (the sodium salt of propanoic acid) as effective a soap as sodium stearate (the sodium salt of stearic acid)? Explain.
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Is sodium propanoate (the sodium salt of propanoic acid)
as effective a soap as sodium stearate (the sodium salt of stearic
acid)? Explain.
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- Discuss why sodium hydroxide may be used in conjunction with triethanolamine to react with stearic acid in the formulation of vanishing creams.An amino acid mixture consisting of lysine, leucine, and glutamic acid is to be separated by ion-exchange chromatography, using a cationexchange resin at pH 3.5, with the eluting buffer at the same pH. Which of these amino acids will be eluted from the column first? Will any other treatment be needed to elute one of these amino acids from the column?A 1.000-g sample containing bromide was dissolved in sufficient water to give 100.0 mL. A 50.00 mL aliquot was measured and after acidification, silver nitrate was introduced to precipitate AgBr, which was filtered, washed, and then dissolved in an ammoniacal solution of potassium tetracyanonickelate(II): Ni(CN)42- + 2AgBr(s) → 2Ag(CN)2- + Ni2+ + 2Br- The liberated nickel ion required 11.70 mL of 0.002146 M EDTA. The other 50.00 mL remaining solution was also analyzed for its Br- content by potentiometry using a metallic electrode of the second kind. e) Write the cell notation of the potentiometric set-up with SCE as the reference electrode. f) Write the Nernst equation that describes the indicator electrode set-up.
- 439 mL of 0.270 M hydrochloric acid is exactly neutralized with 0.920 M potassium hydroxide solution. What volume of base solution is required?A glucosamine solution of unknown concentration was diluted as follows: 1 mL of the solution was diluted to 5.0 mL. A 0.3 mL aliquot of this solution was diluted with 0.7 mL of water; the absorbance of this was measured and found to be 0.440 (uncorrected, must subtract blank). What is the concentration of the original undiluted glucosamine hydrochloride solution in µmol/mL? Given: Corrected absorbance = 0.395 y= 1.165x+0.055 Standard equationNEORAL oral solution contains 100 mg/mL of cyclosporine. If a pharmacist prepares 30 mL of an oral solution containing 10% w/v cyclosporine, how many milliliters of diluent should be used?
- An amino acid mixture of phenylalanine, glycine and glutamic acid is to be separated by paper chromatography.The solvent is less polar than water. Which of these amino acids will have the highest Rf value and which the lowest? Explain.An amino acid mixture of phenylalanine, glycine and glutamic acid is to be separated by paper chromatography. The solvent is less polar than water. Which of these amino acids will have the highest Rf value and which the lowest? Explain.Methadone is dispensed as its hydrochloride salt. What is the use of the salt rather than the amine?
- What is the purpose of: A. The concentrated salt solution? B. adding isopropyl alcohol to the solution? Why does it need to be in low temperature?A mixture of lipids is applied to a silica gel column (a column chromatography), and the column is then washed with increasingly non-polar solvents. The mixture consists of phosphatidylserine, phosphatidylethanolamine, phosphatidylcholine, cholesteryl palmitate (a sterol ester), sphingomyelin, palmitate, n-tetradecanol, triacyglycerol, and cholesterol. In what order will the lipids elute from the column? Explain the reasons for your answer(s).You need to make 20 mL of a 1/100 (10-2) dilution of a crystal violet solution? How much diluting fluid will be required? Note: Your answer should be in numerical format to the nearest 0.1 mL.