Redox Problem. Given reaction between dissolved Fe2+ and elemental sulfur (S0) to form hematite (Fe2O3) and sulfide HS-      Fe2+ +  S0 -->  Fe2O3 +  HS- (a) What the oxidant and reductant in this reaction? You must determine half-reactions and balance the reaction.   (b) Is this reaction thermodynamically favorable?   (c) Would this HS- to react readily with Fe2O3 (reverse of the reaction

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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.