Question

What anions generally form precipitates? What are the exceptions?

Answer 1

Answer:

Carbonates (CO3-2), phosphates (PO4-3) and sulfides (S-2) are insoluble.

The exceptions are the alkali metals and the ammonium ion.

Answer 2

OH−,S−2,CO3S−2, and PO−34 O H − , S − 2 , C O 3 S − 2 , a n d P O 4 − 3 will generally form precipitates with the exceptions being when the cations are: Li+,Na+,K+.

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