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The salt bridge can be prepared by soaking strips of filter paper in saturated potassium nitrate solution.
The Ecell value obtained will be small. This gives an opportunity to correct a misconception that many students have. They tend to assume that with a small value there will be very little product, not remembering that even at 0V the reaction will be half complete.
Materials:
| 1M copper(II) sulfate (50 cm3) | 0.1 M iodine in KI (50 cm3) |
| 0.1 M Fe2+/Fe3+ mixture | Copper metal electrode |
| Platinum electrodes (2) | Salt bridges |
| 1% starch solution | 1% potassium hexacyanoferrate(III) solution |
| 0.1 M iron(III) chloride | 0.1 M potassium iodide |
| Test tubes (6) | Dropping pipettes |
| 100 cm3 beaker (3) | Connecting leads |
| Voltmeter |
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