.. _sphx_glr_api_gallery_electrochem_nernst:

The Nernst equation
---------------------

Standard and concentration cells via the Nernst equation, and
Debye-Huckel activity-coefficient-corrected reaction quotients.


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    <div class="sphx-glr-thumbcontainer" tooltip="nernst_potential implements E = E^\circ - \frac{RT}{nF}\ln Q. This example checks that it reduces to E^\circ at Q=1, plots the logarithmic dependence on the reaction quotient, and then builds a concentration cell (~chemistrykit.electrochem.systems.nernst.concentration_cell_potential) whose voltage comes entirely from a concentration difference -- about 59 mV per decade for a one-electron couple at 25 degC, as Nernst predicted.">

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  .. image:: /api/gallery/electrochem/nernst/images/thumb/sphx_glr_plot_01_nernst_equation_thumb.png
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  :doc:`/api/gallery/electrochem/nernst/plot_01_nernst_equation`

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      <div class="sphx-glr-thumbnail-title">The Nernst equation: cell potential versus concentration</div>
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    <div class="sphx-glr-thumbcontainer" tooltip="Debye and Hückel (1923) showed that each ion&#x27;s cloud of counter-ions lowers its activity below its concentration, by an amount growing with ionic strength and ionic charge. This example uses nernst_potential_with_activity (built on chemistrykit.solutions.systems.activity) to show how the potential of a Cu2+/Cu electrode drifts away from the ideal Nernst value as the solution gets more concentrated, and that the correction vanishes in the dilute limit.">

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  .. image:: /api/gallery/electrochem/nernst/images/thumb/sphx_glr_plot_02_debye_huckel_activity_thumb.png
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  :doc:`/api/gallery/electrochem/nernst/plot_02_debye_huckel_activity`

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      <div class="sphx-glr-thumbnail-title">Debye-Hückel activity corrections to the Nernst equation</div>
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.. toctree::
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   /api/gallery/electrochem/nernst/plot_01_nernst_equation
   /api/gallery/electrochem/nernst/plot_02_debye_huckel_activity