`AlF_(3)` is insoluble in andydrous HF but when little KF is added to the compounds it becomes soluble. On addition of `BF_(3),AlF_(3)` is precipitated Write the balanced chemical equation .

Explanation

To solve the question, we need to write the balanced chemical equations for the reactions involving aluminum fluoride (AlF₃), potassium fluoride (KF), and boron trifluoride (BF₃).

### Step-by-Step Solution:

1. **Understanding the Initial Reaction**:
- Aluminum fluoride (AlF₃) is insoluble in anhydrous HF. However, when potassium fluoride (KF) is added, it forms a soluble complex.
- The reaction can be represented as follows:
\[
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