Question

On combining two aqueous solutions of soluble ionic compounds, a precipitate is formed when

• A. the solvent is insoluble.
• B. the reactant is insoluble.
• C. the product is insoluble.
• D. a gas is evolved.

Answer 1

The correct option is C

the product is insoluble.

When the aqueous solutions of two ionic compounds react by exchanging their ions, to form two or more new compounds, such that one of the products formed is an insoluble salt, and hence forms a precipitate, the double displacement reaction is said to be a precipitation reaction.