Ion selective elctrodes are indicator electrodes which respond directly to the a

Question

Ion selective elctrodes are indicator electrodes which respond directly to the analyte. they selectively bonds and measures the activity of one ion i.e. having no redix chemistry. they are made from a permselective ion conducting membrane having inbuild reference elctrode and internal solution contains ion of interest with constant activity. So they respond preferentially to one species in solution.

For, Cu2+ ion selective electrode, Cu2+ is the preferntial ion,

different conxentration of Cu2+ inside and outside the electrode resultsa in a potential diffrence across the membrane. i.e.

E=RT/Zi F ln ([Cu2+]outer/ [Cu2+]inner)

at 25 oC,

E=0.059/Zi log ([Cu2+]outer/ [Cu2+]inner)

10 fold change in concentration implies 0.05916/Zi V or 59.16/Zi mV changes in E

for, Cu2+, Zi =2

so, for a 10 fold change in concentration , the response of a Cu2+ ion selective electrode changes by 29.58 mV or 29.6 mV

Explanation / Answer

Show that the response of a Cu ions selective electrode changes by 29.6 mV for a 10-fold change in concentration

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