Study Notes
Salts and solubility involve understanding how substances dissolve and how salts are formed through chemical reactions. Solubility is influenced by factors like temperature and pressure.
- Solubility — a measurement of how much of a substance will dissolve in a given volume of a liquid. Example: Solubility of sugar in water increases with temperature.
- Saturated Solution — a solution that contains the maximum amount of solute that can be dissolved under the given conditions. Example: Adding sugar to water until no more dissolves results in a saturated solution.
- Salt — a compound made when a metal replaces the hydrogen in an acid. Example: Hydrochloric acid reacts with sodium to form sodium chloride (table salt).
- Precipitation Reaction — a reaction where two soluble salts react to form an insoluble salt. Example: Mixing silver nitrate and sodium chloride solutions forms a white precipitate of silver chloride.
Exam Tips
Key Definitions to Remember
- Solubility
- Saturated Solution
- Salt
- Precipitation Reaction
Common Confusions
- Confusing solubility with saturation
- Misunderstanding the effect of temperature on gas solubility
Typical Exam Questions
- What is solubility? Solubility is the measurement of how much of a substance will dissolve in a given volume of a liquid.
- How does temperature affect the solubility of solids? As temperature increases, solids usually become more soluble.
- What happens in a precipitation reaction? Two soluble salts react to form an insoluble salt.
What Examiners Usually Test
- Understanding of how solubility changes with temperature and pressure
- Ability to describe the process of forming salts from acids and bases
- Knowledge of the indicators of a chemical reaction