Mention two important substances present in the 'anode mud' obtained in the electrorefining of copper.

Explanation

To answer the question regarding the important substances present in the 'anode mud' obtained from the electrorefining of copper, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Electrorefining of Copper**:
- Electrorefining is a process used to purify copper. It involves the use of an electrolytic cell where impure copper is used as the anode and pure copper is deposited at the cathode.

2. **Formation of Anode Mud**:
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