4 Solutions and Solubility

Learning Targets

• Describe a solution and identify its properties.

Solutions Overview

• A solution is made up of two components: solvent (larger quantity) and solute (smaller quantity).

• The most common solvent is water due to its ability to dissolve a wide range of substances.

Properties of Solutions

• Solutions have homogeneous properties.

• Particles are too small to scatter light.

Types of Solutions Based on Phases

• Liquid Solutions

• Solid Solutions

• Gaseous Solutions

Liquid Solutions

• System types:

  • Liquid-Solid (e.g., Seltzer Water)

  • Liquid-Liquid (e.g., Tea)

  • Liquid-Gas (e.g., Carbonated drinks)

Solid Solutions

• Solid-Solid: e.g., Bronze (Copper + Tin)

• Solid-Liquid: e.g., Dental Amalgam (Silver + Mercury)

Gaseous Solutions

• Gas-Gas Systems: e.g., Air (Nitrogen 78%, Oxygen 21%).

Types of Solutions Based on Concentration

Qualitative

• Described using terms like:

  • Concentrated

  • Dilute

Quantitative

• Measured in specific amounts:

  • Dilute Solution: Small solute amount per solvent.

  • Concentrated Solution: Large solute amount per solvent.

  • Unsaturated Solution: Less than maximum solute dissolved.

  • Saturated Solution: Maximum solute dissolved.

  • Supersaturated Solution: More solute than can be dissolved.

Examples

• Dilute Solution: Light-colored tea vs. dark tea.

• Concentrated Solution: Sticky sugar solution vs. watery sugar solution.

• Urine Color Chart: Used to determine hydration levels.

Quick Check

• Various examples of solutions:

  • Sugar solution: Liquid (Liquid-Solid)

  • Coke in a can: Liquid (Liquid-Gas)

  • Sterling silver jewelry: Solid (Solid-Solid)

Conclusion

• Understanding the properties and types of solutions is crucial for chemistry. Solutions can be categorized based on their phases and concentration, influencing their behavior and practical applications.