Write the chemical name and chemical formula of the salt used to remove permanent hardness of water.

Explanation

To answer the question regarding the chemical name and chemical formula of the salt used to remove permanent hardness of water, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Permanent Hardness**:
- Permanent hardness in water is caused by the presence of soluble salts of magnesium and calcium, particularly in the form of chlorides or sulfates. This type of hardness cannot be removed by boiling.

2. **Identifying the Treatment**:
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