The potassium ion selective electrode uses valinomycin as its ionophore to achieve high level of selectivity overother ions. Given the following selectivity data (kij) for this ISE, answer the following questions: (You mayassume that activity = concentration).Interferant ionNa+Ca²+Mg2+Log kij-4-7-7a) How much greater must [Na+] be than [K+] for the two ions to give an equal response?(c) If the calibration constant (Econst) was previously found to be 0.197 V. Calculate [K+] if the ISE gives areading of -0.029 V in a solution which also contains 0.5 M Nat and 0.2 M Ca²+. Give the answer in μM (micromolesper litre).

Given: Econst=0.197 V0.5M Ca+,0.2MCa2+

Answered: s. Given the following selectivity data…

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s. Given the following selectivity data (kij) for this ISE, à Chat activity = concentration). erant ion Log k -4

Chemistry

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ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

The potassium ion selective electrode uses valinomycin as its ionophore to achieve high level of selectivity over
other ions. Given the following selectivity data (kij) for this ISE, answer the following questions: (You may
assume that activity = concentration).
Interferant ion
Na+
Ca²+
Mg2+
Log kij
-4
-7
-7
a) How much greater must [Na+] be than [K+] for the two ions to give an equal response?
(c) If the calibration constant (Econst) was previously found to be 0.197 V. Calculate [K+] if the ISE gives a
reading of -0.029 V in a solution which also contains 0.5 M Nat and 0.2 M Ca²+. Give the answer in μM (micro
moles
per litre).

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