Credit: RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA/SCIENCE PHOTO LIBRARY

Caption: Demonstration of the voltage generated by an iodine-permanganate galvanic cell. The beakers contain a solution of potassium iodide (left) and potassium permanganate solution (right), linked by a salt-saturated bridge of wet paper. A voltmeter is connected to two graphite electrodes. When the electrode is placed in the permanganate, a voltage of 0.83V is seen on the voltmeter. This is produced as permanganate is a powerful oxidising agent and it oxidises iodide ions to iodine. The permanganate itself is reduced to manganate ions. This generates a flow of electrons and ions around the circuit.

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Keywords: beaker, beakers, bench, chemical, chemistry, clip, crocodile clips, current, demonstrating, demonstration, education, educational, electric, electrochemistry, electrolytic, galvanic, glassware, iodide, iodine, ion, ionic, ions, lab, laboratory, metal, permanganate, potassium, reacting, reaction, salt bridge, salts, school, science, solution, solutions, voltage, voltaic, voltmeter, wire

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Iodine and permanganate galvanic cell

K004/2701 Rights Managed

Downloadable master

Duration: 00:00:12.24

Frame size: 1920x1080

Frame rate: 25

Audio: No

Format: QuickTime, Photo JPEG 100%, progressive scan, square pixels

File size: 340.7M

Original

Capture format: Sony FS700

Codec: H.264

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