Final answer:
Solubility rules are guidelines that determine whether an ionic compound will dissolve in water or precipitate. They are critical in predicting the outcomes of chemical reactions, particularly double-replacement reactions.
Step-by-step explanation:
Solubility rules are a set of guidelines that help predict whether an ionic compound will dissolve in water to form an aqueous solution or form a solid and precipitate out. These rules are important when determining the outcome of double-replacement reactions in chemistry.
According to solubility rules, compounds such as those containing ions like Li+, Na+, K+, Rb+, Cs+, and NH4+, as well as anions like NO3− and C2H3O2− are generally soluble. If a compound is determined to be soluble, it is denoted with an (aq) label, indicating it dissolves in water. Conversely, if a compound is insoluble, the (s) label is used, suggesting it will precipitate out. It is essential to follow the solubility rules strictly from top to bottom, as earlier rules take precedence over the latter ones.