From electromotive cell measurements at 435°C the following equation has been found activity coefficient of zinc in cadmium-zinc alloys: ln γZn = 0.87(1 -NZn) 2 - 0.30(1-NZn) 3 Find an equation for the activity coefficient of cadmium in these alloys by means of the Gibbs-Duhem equation.

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Q: Determine AG° for a reaction when AG = -171.0 kJ/mol and Q = 0.043 at 298 K. (R = 8.314 J/mol K) ●

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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.