CaSO(4) is insoluble but is not precipit...

`CaSO_(4)` is insoluble but is not precipitated when excess of `(NH_(4))_(2)SO_(4)` is added to `CaCl_(2)`. Explain

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`CaSO_(4)+(NH_(4))_(2) SO_(4) rarr (NH_(4))_(2)[Ca(SO_(4))_(2)]`

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