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Which of the following is a classic example of a colloidal sol?
Sugar solution
Muddy water
Paint
Salt solution
Paint
A colloidal sol is a heterogeneous mixture where microscopic insoluble particles of one substance (dispersed phase) are suspended throughout another substance (dispersion medium). Paint is a classic example of a sol where solid pigment particles are dispersed in a liquid vehicle.
A colloidal sol is a heterogeneous mixture where microscopic insoluble particles of one substance (dispersed phase) are suspended throughout another substance (dispersion medium). Paint is a classic example of a sol where solid pigment particles are dispersed in a liquid vehicle.
Think of paint like a dense fog where solid particles are trapped in liquid, unlike a sugar solution where the sugar vanishes into the water to become a clear, homogeneous mixture.
1┬аnm<particle┬аsize<1000┬аnm тАФ Represents the size range of dispersed particles in a colloidal system.
Colloids maintain stability due to the Brownian motion of particles, which counteracts gravity, and electrical charges on the particle surfaces that prevent coagulation. In paint, the solid particles are held in the liquid medium to prevent settling, often assisted by surfactants or stabilizers.
Colloids are heterogeneous in nature despite appearing homogeneous to the naked eye.
Colloids exhibit the Tyndall effect, where light is scattered by dispersed particles.
The dispersed phase in a sol is solid and the dispersion medium is liquid.
Provides uniform distribution of color and protection in industrial coatings.
Subject to phase separation (settling) over long periods without agitation.
Manufacturing of paints and enamels.
Formulation of pharmaceutical suspensions and biological fluids like blood.
Sugar and salt solutions are true solutions because the solute particles are dissolved at the molecular or ionic level, creating a homogeneous mixture.
Muddy water is typically classified as a suspension because particles are large enough (>1000┬аnm) to settle under gravity.
A sol is specifically defined as a colloidal system where the dispersed phase is solid and the dispersion medium is liquid.
C is correct тАФ Paint is a colloidal sol because it consists of fine solid pigment particles dispersed in a liquid solvent.
Always remember: True solutions have particle sizes <1┬аnm, colloids have sizes between 1┬аnm and 1000┬аnm, and suspensions have sizes >1000┬аnm.