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# Ion selective electrode problem

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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

##### Solution Summary

Ion selective electrode problems are analyzed for potassium ISE. The solution is given in the attachment in 450-500 words including tables.

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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 ...

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