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One glass-membrane sodium ion-selective electrode has a selectivity coefficient . When
Chapter 14, Problem 14-D(choose chapter or problem)
One glass-membrane sodium ion-selective electrode has a selectivity coefficient . When this electrode was immersed in 1.00 mM NaCl at pH 8.00, a potential of 38 mV (versus S.C.E.) was recorded. (a) Neglecting activity coefficients, calculate the potential with Equation 14-10 if the electrode were immersed in 5.00 mM NaCl at pH 8.00. (b) What would the potential be for 1.00 mM NaCl at pH 3.87? You can see that pH is a critical variable for the sodium electrode.
Questions & Answers
QUESTION:
One glass-membrane sodium ion-selective electrode has a selectivity coefficient . When this electrode was immersed in 1.00 mM NaCl at pH 8.00, a potential of 38 mV (versus S.C.E.) was recorded. (a) Neglecting activity coefficients, calculate the potential with Equation 14-10 if the electrode were immersed in 5.00 mM NaCl at pH 8.00. (b) What would the potential be for 1.00 mM NaCl at pH 3.87? You can see that pH is a critical variable for the sodium electrode.
ANSWER:Step 1 of 5
Ion-selective electrodes
Electrodes used to find the concentration of a single ion in solution, unique to each electrode, are called ion-selective electrodes. These electrodes are covered by a membrane allowing the passage of only the desired ion to the electrode. Thus, the electrode notes only its concentration.
The ion selective electrodes are generally used in medical tests when the concentration of a particular ion is to be measured in the body.
Ion selective electrodes are divided into different classes, including the glass membrane electrode (for hydrogen and other monovalent ions), solid-state, liquid-based, and compound electrodes.