By how many volts will the potential of an ideal Mg2+ ion selective electrode (ISE) change if the electrode is removed from a 1.0 x 10-4 M solution of MgCl2 and placed in 1.0 x 10-3 M MgCl2? 28 mL of 0.1M Ce4+ is mixed with 50 mL of 0.05M Fe2+. The solution potential is monitored with a Pt indicator electrode and an Ag/AgCl reference electrode. Calculate the potential of the Pt electrode and the cell potential. An ion selective electrode for NO2- has the following values of Log k for the listed interferents. Interferent Logk F- -3.1 SO42- -4.1 I- -1.2 NO3- -3.3 Which ion is the most serious interferent? Why? For what activity of this interferent is the potential (E) equivalent to a solution inwhich aNO2- = 2.75 x 10-4 ? A glass and calomel electrode system was found to develop a potential of -0.0412V when dipped into a pH 6.00 buffer. When in an unknown solution, the cell potential was found to be -0.2004 V. Calculate the pH and the activity of hydrogen ion in the unknown solution. Suppose that when the cell potential for the unknown solution in # 3 was measured, the voltage reading was unstable and the values ranged from -0.1950 to -0.2020 V. Based on these data, estimate S/N for that electrode measurement system. Use absolute values in your calculation. 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.

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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

Chapter23: Potentiometry

Section: Chapter Questions

Problem 23.7QAP

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By how many volts will the potential of an ideal Mg²⁺ ion selective electrode (ISE) change if the electrode is removed from a 1.0 x 10^-4 M solution of MgCl₂ and placed in 1.0 x 10^-3 M MgCl₂?

28 mL of 0.1M Ce⁴⁺ is mixed with 50 mL of 0.05M Fe²⁺. The solution potential is monitored with a Pt indicator electrode and an Ag/AgCl reference electrode. Calculate the potential of the Pt electrode and the cell potential.

An ion selective electrode for NO₂^- has the following values of Log k for the listed interferents.

Interferent Logk

F^- -3.1

SO₄^2- -4.1

I^- -1.2

NO₃^- -3.3

Which ion is the most serious interferent? Why? For what activity of this interferent is the potential (E) equivalent to a solution in

which a_NO2-= 2.75 x 10^-4 ?

A glass and calomel electrode system was found to develop a potential of -0.0412V when dipped into a pH 6.00 buffer. When in an unknown solution, the cell potential was found to be -0.2004 V. Calculate the pH and the activity of hydrogen ion in the unknown solution.

Suppose that when the cell potential for the unknown solution in # 3 was measured, the voltage reading was unstable and the values ranged from -0.1950 to -0.2020 V. Based on these data, estimate S/N for that electrode measurement system. Use absolute values in your calculation.

A bare silver wire electrode is dipped into a solution 0.05M in KNO₃ (supporting electrolyte) and saturated in AgBr (K_sp= 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.

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