Chemistry Homework Solutions
Problem
#11547

Ion selective electrode problem

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Ion selective electrode problem.doc
The data below is obtained with a potassium ISE. To avoid interferences
from H+ and

variations in ionic strength all solutions were made to contain 0.33 M
Ca(NO3)2 and

0.0010 M NaOH. An unknown solution was similarly prepared and gave a
reading of

-0.0273 volts.

a) What is the slope of the ISE response? (This is the same as the
coefficient of the log

term in the ISE equation). What is the value of E', (also known as k)?

b) What is the concentration of K+ in the unknown?

c) What is the lowest [K+] value that can be accurately measured using
the ISE and the

procedure described?

d) What is selectivity constant, kK,Na , for the ISE?

Log [K+] E (volts)

-1.3 -0.165

-2.3 -0.221

-3.0 -0.259

-3.7 -0.298

-4.7 -0.350

-5.3 -0.381

-6.3 -0.413

-7.0 -0.421

-8.0 -0.424

-9.0 -0.424


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