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Last updated 4:06 PM on 6/14/26
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4 Terms

1
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Describe the method to measure the EMF of an electrochemical cell

  1. Clean a piece of copper and a piece of zinc using fine grade sandpaper

  2. Degrease the metal using some cotton wool and propanone

  3. Place the copper into a 100cm3 beaker with about 50cm3 of 1moldm-3 CuSO4 solution

  4. Place the zinc into a 100cm3 beaker with about 50cm3 of 1moldm-3 ZnSO4 solution

  5. For salt bridge- lightly plug one end of the ends of an inverted U-tube and fill with NaCl then plug free end and join the 2 beakers so plugged ends are in separate beakers OR use a strip of filter paper soaked in saturated KNO3 solution

  6. Connect the half cells by connecting the metals to the voltmeter, using crocodile clips, and read off the voltage

2
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What is salt bridge used for?

Connects circuit by allowing movement of ions

3
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Why do you need to file/sand away the outer layer of the metal?

To remove the oxide layer on the outside of the metal

4
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Why is a platinum electrode used when the half cell doesnt contain a conducting metal?

Platinum is unreactive and can conduct electricity