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Colloids and Beer's Law

A series of free High School Chemistry Video Lessons.

In these lessons, we will learn

  • Osmosis
  • Colloids - Suspensions
  • Beer's Law

Osmosis is the diffusion of water molecules across a semi-permeable membrane from an area of high concentration to an area of low concentration. In cells, osmosis occurs across the cellular membrane to keep a cell from becoming flaccid (not enough water) or turgid (too much water).
The definition and importance of osmosis.
Diffusion and Osmosis.

Colloids - Suspensions
Suspensions are mixtures of particles that settle out if let undisturbed. Suspensions can be filtered, while solutions cannot. Colloids are a type of mixture whose particles are held together through Brownian Motion, the erratic movement of colloid particles. Colloids cause the Tyndall Effect, or scattered light due to Brownian motion. The size of the particles found in colloids is smaller than those found in suspensions and greater than those found in solutions. One commonly known colloid is milk.
Understanding the differences between colloids and suspensions.
Suspensions, Colloids and Solutions. The difference between Molarity and Molality.

Beer's Law
Beer’s Law states that a solution's absorbance of light at a certain wavelength is directly proportional to the concentration of that solution. Beer’s Law is mathematically expressed as M1/A1= M2/A2.
Understanding the relationship between the concentration of a material and its absorption of light.
Beer's Law Laboratory.

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