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| | Orange Juice Clock |
 | | The Orange Juice Clock, in which a galvanic cell is made from the combination of a magnesium strip, a copper strip, and juice in a beaker, has been a popular classroom, conference, and workshop demonstration for nearly 10 years. |
 | | The pH of the juice, initially 3.85 at 20 °C, was 3.93 at the end of the experiment, as measured with a portable pH meter. |
 | | The resistance of the orange juice is then calculated via the difference between the open circuit voltage (1.772 V) and the voltage with a known resistance (1.037 V). |
| jchemed.chem.wisc.edu /JCESoft/CCA/CCA3/MAIN/OJCLOCK/PAGE2.HTM (3238 words) |
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