Write the changes at the electrodes and in the cell during the purification of copper by electrolysis .

Explanation

### Step-by-Step Solution:

1. **Setup of the Electrolytic Cell**:
- In the purification of copper by electrolysis, the electrolytic cell consists of two electrodes: the anode and the cathode.
- The anode is made of impure copper, while the cathode is made of pure copper.
- The electrolyte used is a solution of 15% copper sulfate (CuSO₄) and 5% sulfuric acid (H₂SO₄).

2. **Current Flow and Reactions**:
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