Final answer:
A slightly soluble double replacement is a precipitation reaction where two ionic compounds react in aqueous solution and form a new insoluble compound, resulting in a solid precipitate.
Step-by-step explanation:
A slightly soluble double replacement reaction is classified as a precipitation reaction. This type of reaction involves the exchange of ions between two ionic compounds in aqueous solution, leading to the formation of a new ionic compound that is insoluble.
The insoluble compound forms a solid precipitate, which is the driving force behind the reaction proceeding. For example, CdSO4 (aq) + K₂S(aq) → CdS(s)+K₂SO4 (aq), where CdS is the solid precipitate formed during the reaction. Solubility rules are important for predicting the products of such reactions and determining which ionic compound will precipitate.