Characteristics of a Colloid. A colloid is a mixture composed of particles in a dispersing medium. A colloid is defined by the size of the particles involved. If the particles in a mixture are on the scale of individual molecules, around 1 nanometer, it is defined as a solution.
Similarly one may ask, how do you identify a colloid?
To identify a colloid mixture from a solution, you can use the Tyndall effect. This is where you pass a light through the mixture. If the light bounces off the particles, you will see the light shine through and you have a colloid mixture.
Why would this fog be considered to be a colloid?
The beam of light can be easily seen because the fog is a colloid. Figure 2: Light being shined through water and milk. The larger dispersed particles in a colloid would be unable to pass through the membrane, while the surrounding liquid molecules can.
How is a suspension different from a colloid?
A colloid is a substance in which microscopic particles are dispersed in a medium, but are not dissolved in it. A suspension is similar to a colloid except that the dispersed particles tend to be larger and will eventually settle or form sediment.