Some students investigated the electrolysis of copper nitrate solution using inert electrodes. Figure 1 shows the apparatus The students investigated how the mass of copper produced at the negative electrode varied with Suggest how the students could find the total mass of copper produced.- 6124

Q1.

Some students investigated the electrolysis of copper nitrate solution using inert

electrodes.

Figure 1 shows the apparatus

The students investigated how the mass of copper produced at the negative

electrode varied with:

• time

• current.

This is the method used.

1. Weigh the negative electrode.

2. Set up the apparatus shown in Figure 1.

3. Adjust the power supply until the ammeter shows a current of 0.3 A

4. Switch off the power supply after 5 minutes.

5. Rinse the negative electrode with water and allow to dry.

6. Reweigh the negative electrode.

7. Repeat steps 1 to 6 for different times.

8. Repeat steps 1 to 7 at different currents.

(d) Some of the copper produced did not stick to the negative electrode but fell

to the bottom of the beaker.

Suggest how the students could find the total mass of copper produced.

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