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Question
Copy and complete the following table :
| Anode | Electrolyte | |
| Purification of copper |
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Solution
| Anode | Electrolyte | |
| Purification of copper | Impure copper | Solution of copper sulphate and dilute sulphuric acid |
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RELATED QUESTIONS
State one relevant observation for the following:
At the anode when aqueous copper sulphate solution is electrolysed using copper electrodes.
Copy and complete the following table:
| Anode | Electrolyte | |
| Purification of copper |
Out of Cu and Ag, which is more active?
How would you change Cu2+ ion to Cu?
Give reason for the following:
For electroplating with silver, silver nitrate is not used as an electrolyte.
The following question relate to the electroplating of an article with silver.
What ions must be present in the electrolyte?
A solution of silver nitrate is a good electrolyte but is not used for electroplating an article with silver.
Draw a labelled diagram to show how iron is electroplated with copper.
Which solution is preferred as electrolyte, CuSO4 or FeSO4?
Electroplating steel objects with silver involves a three-step process.
Step 1: A coating of copper is applied to the object.
Step 2: A coating of nickel is applied to the object.
Step 3: The coating of silver is applied to the object.
-
- A diagram of the apparatus used for step 1 is shown
- The chemical process taking place on the surface of the object is \[\ce{Cu^2+(aq) + 2e- ->Cu(s)}\]
What is the observation seen on the surface of the object? - Explain why the concentration of copper ions in the electrolyte remains constant throughout step 1.
- The chemical process taking place on the surface of the object is \[\ce{Cu^2+(aq) + 2e- ->Cu(s)}\]
- A diagram of the apparatus used for step 1 is shown
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- Write down the reaction taking place at the positive electrode during step 3.
