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Aldon™ Micro AP Chemistry Kits: Determination of Thermodynamic Properties of a Reaction Using Electrochemical Cells
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Catalog No. S68322 Shop All Aldon Products
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Ap Chemkit-electrochmicl Cell
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S68322 Ap Chemkit-electrochmicl Cell
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Catalog No. S68322 Supplier Aldon™ Supplier No. DD1051
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Description

Concepts covered: Thermodynamic properties, Gibbs free energy change (ΔG), enthalpy change (ΔH), entropy change (ΔS), equilibrium constant (K), electrochemical cell, e.m.f. of a cell, standard e.m.f., redox reaction, half reactions.

The main objective of this experiment is to show how thermodynamic properties of reactions such as Gibbs free energy changes (ΔG), enthalpy changes (ΔH), entropy changes (ΔS), and equilibrium constants (K) can be obtained from measurements of the e.m.f.'s of electrochemical cells.

The chemical reaction that is studied in this experiment is the reduction of Ag+ ions to Ag by hydroquinone, C6H4(OH)2. The balanced equation for this redox reaction is:

C6H4(OH)2 (aq) + 2Ag+ (aq) → C6H4O2 (aq) + 2Ag(s) + 2H+ (aq)

To study the thermodynamic properties associated with this reaction, the first step is to devise an electrochemical cell in which the cell reaction is the same as the above reaction. From experimental measurements of the e.m.f of this cell, ΔG, ΔS, ΔH, and K for this reaction can be calculated.

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