Please correct answer and don't use hend raiting 24-3. (a) What are the advantages and disadvantages of using a nar-rower open tubular column?(b) What are the advantages and disadvantages of using a longeropen tubular column?(c) What are the advantages and disadvantages of using a thickerfilm of stationary phase?

(a) Advantages and Disadvantages of Using a Narrower Open Tubular ColumnAdvantages:Increased…

Answered: 24-3. (a) What are the advantages and…

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter25: Voltammetry

Section: Chapter Questions

Problem 25.11QAP

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Calibration of a glass electrode gave a reading of 139.1 mV with a 0.05 m potassium dihydrogen citrate buffer standard ( pH = 3.766), and a reading of -75.5 mV with a 0.08 m HEPES, 0.08 m NaHEPES, 0.08 m NaCl buffer standard (pH = 7.454). both measured at 30 °C. What is the observed slope (mV/pH unit) of the calibration curve? slope observed= mV/pH What is the theoretical slope at 30 *C? slope theoretical What is B, the electromotive efficiency, to three significant figures? B= What is the pH of an unknown that gives a reading of 50.2 mV with this electrode at 30 "C? mV/pH
Zinc is to be used as an internal standard for the polarographic analysis of thallium. A standard solution containing twice the concentration of zinc as Thallium has a diffusion current of 1.89 µA for Ti and 3.50 µA for Zn. A 10.0g alloy was dissolved in 500 mL, 25 mL of this solution was mixed with 25 mL of 1.0 x 10-3 M Zn 2+ solution. The diffusion currents of this final solution are 18.2µA for Tl+ and 14.5µA for Zn+. Calculate % Ti in the sample analysed
In a moving boundary experiment with 0.1N KCI using 0.005N LICI, as indicator solution, a constant current of 0.005893 amp was passed for 2130 seconds and the boundary was observed to move through 5.6cm in a tube of 0.1142 sq.cm. .cross-section. Calculate the transport number of K+ and CI – ions .a t- = 0.492, t+ =0.508 t+ = 0.402, t- =0.598 .b O .c O t+ = 0.492, t- =0.508 .d O t+ = 0.402, t- =0.598
A bare silver wire electrode is dipped into a solution 0.05M in KNO3 (supporting electrolyte) and saturated in AgBr (Ksp = 5.0 x 10-13), and connected to the back of an mV/pH meter along with a saturated calomel reference electrode. Calculate the potential of the silver indicator electrode. Calculate the cell potential.
Calibration of a glass electrode gave a reading of 134.9 mV with a 0.05 m potassium hydrogen phthalate buffer standard ( pH = 4.015), and a reading of -69.1 mV with a 0.08 m HEPES, 0.08 m NaHEPES, 0.08 m NaCl buffer standard (pH = 7.454), both measured at 30 °C. What is the observed slope (mV/pH unit) of the calibration curve? slope observed slope theoretical What is the theoretical slope at 30 °C? pH -58.1 5.29 Incorrect What is the pH of an unknown that gives a reading of 41.4 mV with this electrode at 30 °C? Incorrect Incorrect mV/pH mV/pH
Penicillin F is recovered from a dilute aqueous fermentation broth by extraction with amyl acetate, using 6.5 volumes of solvent per 100. volumes of the aqueous phase. At pH = 3.8 the distribution coefficient KD is 74. (a) What fraction of the penicillin would be recovered in a single ideal stage? (b) What would be the recovery with three-stage extraction using fresh solvent in both stages? (c) How many ideal stages would be needed to give the same recovery as in part (b) if a counterflow cascade were used with V/L = 0.065?
6
3) Name the errors of glass electrodes in potentiometric measurements (please write correctly and concisely).
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24-3. (a) What are the advantages and disadvantages of using a nar- rower open tubular column? (b) What are the advantages and disadvantages of using a longer open tubular column? (c) What are the advantages and disadvantages of using a thicker film of stationary phase?