What is direct potentiometry? Write Nernst equation for the following cell: Zn(s) | Zn²⁺(a₁) ║ Cu²⁺(a₂) | Cu(s)

Direct potentiometry is an electrochemical technique used for measuring the concentration of ions or molecules in a solution directly by measuring the potential difference (voltage) between two electrodes immersed in the solution. It is based on the Nernst equation, which relates the electrode potential to the concentration of the ion of interest. In direct potentiometry, a sensing electrode, sensitive to the specific ion being measured, is combined with a reference electrode. The potential difference between _________ ________ ______ _________ _________ __________ _________ ___ ____.
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