Question

Why do some combinations of ionic compounds form a precipitate while others do not

Answer 1

Answer:

This is because of the solubility of the reacting metal salts.

Explanation:

The use of solubility of salts influences the formation of precipitates. Most precipitation reactions occur as a result of the replacement reactions or double placement reactions. A double replacement reaction occurs when two ionic reactants dissociate and bond with respective anion and cation of the other reactant. This is simply a switch over reaction.

A double replacement reaction occurs when a chemical reaction occurs and one of the products formed is insoluble.

Here is an example:

$PdSO_{(aq)} + K_{2}S_{(aq)} = PdS_{(s)} +K_{2}SO_{4}_{(aq)}$

Both reactants are acqeous and the product is solid.

Answer 2

Whether or not such a reaction occurs can be determined by using the solubility rules for common ionic solids.

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