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Ch.19 - Electrochemistry
Chapter 19, Problem 80a

Use the data in Appendix D to predict whether the following reactions can occur under standard-state conditions. (a) Oxidation of Sn2+(aq) by Br2(aq)

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Standard-State Conditions

Standard-state conditions refer to a set of specific conditions used to measure the properties of substances. These conditions typically include a temperature of 25°C (298 K), a pressure of 1 atm, and concentrations of 1 M for solutions. Understanding these conditions is crucial for predicting the feasibility of chemical reactions, as they provide a baseline for comparing thermodynamic data.
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Oxidation-Reduction Reactions

Oxidation-reduction (redox) reactions involve the transfer of electrons between species, resulting in changes in oxidation states. In the given reaction, Sn<sup>2+</sup> is oxidized to Sn<sup>4+</sup>, while Br<sub>2</sub> is reduced to Br<sup>-</sup>. Identifying the oxidizing and reducing agents is essential for predicting whether the reaction can occur spontaneously under standard-state conditions.
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Electrochemical Cell Potential

The electrochemical cell potential, or standard cell potential (E°), is a measure of the driving force behind a redox reaction. It can be calculated using standard reduction potentials from tables. A positive E° indicates that the reaction is spontaneous under standard-state conditions, while a negative E° suggests it is non-spontaneous. This concept is vital for predicting the feasibility of the oxidation of Sn<sup>2+</sup> by Br<sub>2</sub>.
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