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- What is the role of Glycerin in the assay of Boric Acid?I. The reagent prevents the formation of pink color earlier than the expected endpoint.II. The reagent allows the reaction of protons from the acid sample with the hydroxyl ions from the titrant.III. It enhances the water solubility of the difficultly soluble boric acid. a. I, II & III b. II & III c. I & II d. I only e. I & IIIcreate a separations flow chart for Sb3+, Fe3+, Zn2+, Al3+, Cd2+ without using sulfides or thioacetamineWhagt is the purpose of the following? Separate the active ingredients in an unknown over the counter analgesic using TLC (thin layer chromatography). Make a preliminary identification of each active ingredient in an unknown tablet by comparing its Rf value(s) with the Rf values of four different known active ingredients:
- Below are responses generated using the isolated guinea-pig ileum preparation to determine a pA2 value for the cholinergic antagonist homatropine.Responses are expressed in millimetres +/- SDM (n = 4).Plot the data and then determine by Schild analysis the pA2 value and Schild slope. show calculationsWhat conclusions can you draw; does the experiment/data fulfil the criteria for a valid Schild analysis?When testing the absorbance of paracetamol with a uv spectrophotometer the following are the abosorbance levels with the concentration associated, what would this mean in terms of the aim of determining the amount of the analgesic paracetamol in commercial tablets using ultraviolet spectroscopy? Concentration (mg/L) Absorbance 0.75 0.032 1.5 0.075 2.25 0.125 4.5 0.181what is the purpose of TLC Separation & Analysis of Analgesics?
- Below are responses generated using the isolated guinea-pig ileum preparation to determine a pA2 value for the cholinergic antagonist homatropine.Responses are expressed in millimetres +/- SDM (n = 4).1. Plot the data on excel and then determine by Schild analysis the pA2 value and Schild slope 2. show all calculation on a sheet of paper 3. discuss the result with conclusionBelow are responses generated using the isolated guinea-pig ileum preparation to determine a pA2 value for the cholinergic antagonist homatropine.Responses are expressed in millimetres +/- SDM (n = 4).1. Plot the data on a sheet of paper and then determine by Schild analysis the pA2 value and Schild slope 2. show all calculation on a table form on a sheet of paper 3. discuss the result with conclusionA 50.0 mL juice extract is colorimetrically assayed using Nelson’s test. One milliliter (1.00 mL) of the solution and the standard glucose solution (concentration: 1mg/mL) were treated with freshly prepared Nelson’s reagent and arsenomolybdate reagent and then diluted to 10.0 mL separately in properly labeled test tubes. Absorbance at 480 nm for the standard is 1.702 and for the sample, 0.926. A. What is the principle behind the assay? B. Calculate the concentration of the reducing sugar in the 50.0 mL sample in mg/mL. Apply Beer-Lambert’s law.
- A 50.0 mL juice extract is colorimetrically assayed using Nelson’s test. One milliliter (1.00 mL) of the solution and the standard glucose solution (concentration: 1mg/mL) were treated with freshly prepared Nelson’s reagent and arsenomolybdate reagent and then diluted to 10.0 mL separately in properly labeled test tubes. Absorbance at 480 nm for the standard is 1.702 and for the sample, 0.926. A. What is the principle behind the assay? B. Calculate the concentration of the reducing sugar in the 50.0 mL sample in mg/mL. Apply Beer-Lambert’s law: A=bcA 50.0 mL juice extract is colorimetrically assayed using Nelson’s test. One milliliter (1.00 mL) of the solution and the standard glucose solution (concentration: 1mg/mL) were treated with freshly prepared Nelson’s reagent and arsenomolybdate reagent and then diluted to 10.0 mL separately in properly labeled test tubes. Absorbance at 480 nm for the standard is 1.702 and for the sample, 0.926. A. What is the principle behind the assay?During an assay of paracetamol by UV an analyst prepares a series of calibration solutions containing approximately 3-15 mcg/mL paracetamol as follows: 140.1 mg of pure paracetamol was added to a 200 mL volumetric flask. 0.1 M NaOH (50 mL) was added, the mixture well shaken and made up to volume with deionized water 10 mL of the above solution was diluted to 100 mL 1)What is the concentration of the final diluted solution in mcg/mL?(1 decimal) 2) What volume of the diluted solution is required to prepare 100 mL of a 8 mcg/mL standard solution? (1 decimal)
