key term - Ionic compound

Definition

An ionic compound is a chemical compound composed of ions held together by electrostatic forces known as ionic bonds. These compounds typically form between metals and nonmetals, where metals lose electrons to become positively charged cations and nonmetals gain those electrons to become negatively charged anions. The resulting ionic bonds create a stable structure, which plays a crucial role in solubility and reactions in aqueous solutions.

5 Must Know Facts For Your Next Test

1. Ionic compounds usually have high melting and boiling points due to the strong forces of attraction between the oppositely charged ions.
2. These compounds tend to be soluble in water, but their solubility can vary widely based on the specific ions involved.
3. When dissolved in water, ionic compounds dissociate into their individual cations and anions, allowing them to conduct electricity.
4. The solubility product constant (Ksp) helps determine how much of an ionic compound can dissolve in a solution at equilibrium.
5. Ionic compounds often crystallize in a characteristic lattice structure, which maximizes attractive forces between the ions.

Review Questions

• How do ionic compounds form, and what role do cations and anions play in this process?
  • Ionic compounds form when metals react with nonmetals, resulting in the transfer of electrons. Metals lose electrons to become cations, while nonmetals gain those electrons to become anions. This transfer creates a strong electrostatic attraction between the oppositely charged ions, leading to the formation of the ionic bond that holds the compound together.
• Discuss the relationship between solubility product constant (Ksp) and the solubility of ionic compounds in water.
  • The solubility product constant (Ksp) is a key concept for understanding how ionic compounds behave in water. It quantifies the equilibrium between an ionic solid and its dissolved ions. A higher Ksp value indicates greater solubility of the ionic compound, meaning that more of it can dissolve before reaching saturation. Conversely, a lower Ksp suggests that the compound is less soluble in water.
• Evaluate how lattice energy influences the properties of ionic compounds, including their solubility and stability.
  • Lattice energy significantly affects the properties of ionic compounds by determining their stability and solubility. A higher lattice energy indicates stronger attractions between ions, leading to higher melting and boiling points as well as lower solubility in water. Conversely, if lattice energy is lower, the compound is more likely to dissolve in water due to weaker ion interactions. Thus, understanding lattice energy is crucial for predicting how ionic compounds will behave in different environments.

Related terms

Cation:

A positively charged ion that forms when an atom loses one or more electrons.

Anion:

A negatively charged ion that forms when an atom gains one or more electrons.

Lattice Energy: The energy released when gaseous ions combine to form an ionic solid; it is a measure of the stability of the ionic compound.