€ 58 Discuss the mechanism by which the potential of a platinum electrode becomes poised by immer- sion into a solution of Fe(II) and Fe(III) in 1 M HCl. Approximately how much charge is required to shift the electrode potential by 100 mV? Why does the potential become uncertain at low concentra- tions of Fe(II) and Fe(III), even if the ratio of their concentrations is held near unity? Does this ex- perimental fact reflect thermodynamic considerations? How well do your answers to these issues apply to the establishment of potential at an ion-selective electrode? فصل دوم

€ 58 Discuss the mechanism by which the potential of a platinum electrode becomes poised by immer- sion into a solution of Fe(II) and Fe(III) in 1 M HCl. Approximately how much charge is required to shift the electrode potential by 100 mV? Why does the potential become uncertain at low concentra- tions of Fe(II) and Fe(III), even if the ratio of their concentrations is held near unity? Does this ex- perimental fact reflect thermodynamic considerations? How well do your answers to these issues apply to the establishment of potential at an ion-selective electrode? فصل دوم

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Potentiometric Titrations

Potentiometric titration is one of the important titration methods and is mainly carried out to characterize acid solutions. It follows a method similar to that of the normal titration technique, but the main difference is that there is no indicator used in the potentiometric titrations. Instead of using an indicator, electrodes are employed for monitoring the whole titration process. A scientist named Robert Behrend did the potentiometric titration for the first time, and it was done using the mercurous solution and potassium chloride.

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Subject
Year
Month,
58
Discuss the mechanism by which the potential of a platinum electrode becomes poised by immer-
sion into a solution of Fe(II) and Fe(III) in 1 M HCl. Approximately how much charge is required to
shift the electrode potential by 100 mV? Why does the potential become uncertain at low concentra-
tions of Fe(II) and Fe(III), even if the ratio of their concentrations is held near unity? Does this ex-
perimental fact reflect thermodynamic considerations? How well do your answers to these issues
apply to the establishment of potential at an ion-selective electrode?
Date.
فصل دوم
مراجع استاد

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