Why is `CaSO_(4)` not precipitated on adding ammonium sulphate to a solution containing `Ca^(2+)` and `Sr^(2+)` ions?

Explanation

To answer the question of why calcium sulfate (CaSO₄) is not precipitated when ammonium sulfate ((NH₄)₂SO₄) is added to a solution containing calcium ions (Ca²⁺) and strontium ions (Sr²⁺), we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Components**:
- We have a solution containing calcium ions (Ca²⁺) and strontium ions (Sr²⁺).
- We are adding ammonium sulfate, which dissociates into ammonium ions (NH₄⁺) and sulfate ions (SO₄²⁻).

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