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Statements i, ii, and iii are given. Select the correct option.
i, ii and iii
Only i and ii
Only i
Only ii and iii
i, ii and iii
A suspension is a heterogeneous mixture in which solute-like particles do not dissolve but remain suspended throughout the solvent. Because the particles are relatively large (typically larger than 100 nm), they scatter light (Tyndall effect) and eventually settle down under gravity, making the suspension thermodynamically unstable.
A suspension is a heterogeneous mixture in which solute-like particles do not dissolve but remain suspended throughout the solvent. Because the particles are relatively large (typically larger than 100 nm), they scatter light (Tyndall effect) and eventually settle down under gravity, making the suspension thermodynamically unstable.
Think of muddy water; if you shake a glass of muddy water, the soil particles stay spread out (suspension), but if you leave it undisturbed, the heavy soil particles eventually fall to the bottom, leaving clear water on top.
d>100┬аnm тАФ diameter range of dispersed particles in a suspension
v=9╬╖2r2(╧БpтАЛтИТ╧БfтАЛ)gтАЛ тАФ Stokes' Law describing the settling velocity of particles
In a suspension, the particles are large enough to be seen by the naked eye and are constantly pulled downward by gravity (Stokes' Law). The scattering of light occurs because the particle size is comparable to the wavelength of incident light, causing it to deviate from its path, which renders the light beam visible.
Suspensions are heterogeneous mixtures.
Particles in a suspension scatter a beam of light (Tyndall effect).
Suspensions are unstable as particles settle under gravity when left undisturbed.
Particles are large enough to be separated by filtration.
Easy to separate components via filtration.
Unstable over time (particles settle).
Cannot form a clear homogeneous liquid.
Medicines (syrups that require shaking before use).
Paints and certain pharmaceutical formulations.
Colloids (like milk) appear homogeneous but are heterogeneous and exhibit the Tyndall effect, yet they do not settle under gravity.
Solutions are homogeneous and do not scatter light.
A is correct тАФ All three statements (i), (ii), and (iii) accurately describe the defining characteristics of a suspension.
Always remember the hierarchy of particle size: Solution < Colloid < Suspension. Solutions do not scatter light, whereas both Colloids and Suspensions do.
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