Ohmic potential
Ohmic potential, also known as the Ohmic drop, is a critical concept in electro-analytical chemistry and other electrochemical methods. It refers to the voltage or potential drop that occurs within an electrolyte solution due to the resistance of the solution itself and the electrical conductive path. This phenomenon has significant implications in various electrochemical processes and measurements.
In electro-analytical chemistry, Ohmic potential plays a crucial role in understanding and correcting for errors in electrochemical experiments. When a current flows through an electrolyte solution, the ionic mobility and the solution's resistance cause a voltage drop. This drop can lead to inaccuracies in the measured potential
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| To analyse a brass alloy, a 0.442 g sample is dissolved in acid to volume in a 500 cm3 volumetric flask. Electrolysis of a 10 cm3 sample at − 0.3 V vs. SCE reduces Cu2+ to Cu, requiring total charge of 16.11 C. Adjusting the potential of 0.6 V vs. SCE and completing the electrolysis requires 0.442 C to reduce Pb2+ to Pb. Report the percentage of Cu and Pb in the alloy. |
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| What are the characteristics of a reference electrode? Describe the construction and working of a Calomel electrode. |
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What is the cell potential of an electrochemical cell made of a cadmium electrode
in a 0.1 M Cd(NO3)2 solution and chromium electrode in a 1 × 10−4 M Cr(NO3)3
solution.
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Write down any five applications of DSC technique.
Write special features of coulometric methods
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