O Macmillan LearningIron was electrolytically plated onto a platinum gauze electrode from a solution containing 270 g/L FeSO4 ·7H₂O,50 g/L HNO3, and 6 g/L NaCl at −1.3 V vs. Ag|AgCl. Prior to deposition, the platinum electrode weighed 0.4612 g. After13.74 C were passed through the circuit, the elecrode weighed 0.4649 g. In addition to the reduction of iron, the reduction of H+to H2 also occurs during the electrolysis. What percentage of the charge was used in the reduction of iron?charge used in iron reduction:%Chapter 17 Ho

The amount of iron deposited can be calculated by subtracting the initial weight of the electrode…

Answered: O Macmillan Learning Iron was…

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter21: Potentiometry

Section: Chapter Questions

Problem 21.7QAP

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The following cell was found to have a potential of —0.492 V: Ag|AgCl(sat’d)||HA(0.200 M),NaA(0.300 M)|H2(1.00 atm),Pt Calculate the dissociation constant of HA, neglecting the junction potential.
A conductivity cell filled with a 0.01 M KCl solution was found to have a resistance of 189 ohms at 25oC. When filled with 0.01 M HCl solution, the cell gave a resistance of 64.8 ohms at the same temperature. At 25oC, the conductivity of 0.01 M KCl solution was 1.4088 x 10-3 S cm-1. Calculate (a) the cell constant and (b) the conductivity of the HCl solution. answer is [0.266; 4.105 x 10-3] please explain. thank you!
Calibration of a glass electrode gave a reading of 126.5 mV with a 0.05 m potassium hydrogen phthalate buffer standard ( pH = 4.015), and a reading of -73.7 mV with a 0.008695 m potassium dihydrogen phosphate, 0.0343 m disodium hydrogen phosphate buffer standard (pH = 7400), both measured at 30 C. What is the observed slope (mV/pH unit) of the calibration curve? slopeurd= -59.17 mV/pH What is the theoretical slope at 30 C? 0.984 mV/pH slopeeical= What is 8. the electromotive efficiency, to three significant figures?
(c)Ions that react with Ag+ like SCN- can be determined electrogravimetricallyby deposition on a silver working anode:Ag(s) + SCN- ≤ AgSCN(s) + eA silver anode with initial mass of 12.4730 g was used to electrolyse 85.00 mL of asolution of 0.0245 M KSCN. At the end of the experiment, the anode weighed12.5767 g. How long did the experiment take, if a current of 100 mA was used?
Calibration of a glass electrode gave a reading of 139.3 mV with a 0.05 m potassium hydrogen phthalate buffer standard ( pH = 4.015), and a reading of -160.7 mV with a 0.01 m borax buffer standard (pH = 9.139), both measured at 30 °C. What is the observed slope (mV/pH unit) of the calibration curve? slope observed What is the theoretical slope at 30 °C? = slope theoretical pH : What is the pH of an unknown that gives a reading of 42.5 mV with this electrode at 30 °C? = = mV/pH mV/pH
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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
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A potassium ion-selective electrode is used to measure the concentration of potassium ion in a solution that contains 6.0 x 10-3 M cesium (activity). The electrode responds equally to either ion (KK.C = 1). If the potential versus a reference electrode is -18.3 mV for a 5.0 x 10-3 M KCI solution and +20.9 mV in the sample solution, what is the activity of K+ in the sample? Assume Nernstian response
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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
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