NCERT Solution for Class 9 Science Chapter 2
Is Matter Around Us Pure
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Intext Questions
Page No-18
Questions No-2
How are sol, solution and suspension different from each other?
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Sol is a heterogeneous mixture. In this mixture, the solute particles are so small that they cannot be seen with the naked eye. Also, they seem to be spread uniformly throughout the mixture. The Tyndall effect is observed in this mixture. For example: milk of magnesia, mud
Solution is a homogeneous mixture. In this mixture, the solute particles dissolve and spread uniformly throughout the mixture. The Tyndall effect is not observed in this mixture.
For example: salt in water, sugar in water, iodine in alcohol, alloy
Suspensions are heterogeneous mixtures. In this mixture, the solute particles are visible to the naked eye, and remain suspended throughout the bulk of the medium. The Tyndall effect is observed in this mixture.
For example: chalk powder and water, wheat flour and water
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Sol
They are heterogeneous in nature. They scatter a beam of light and hence show Tyndall effect. They are quite stable.
Solution
They are homogeneous in nature. They do not scatter a beam of light and hence do not show Tyndall effect. Examples of solution are: salt in water, sugar in water.
Suspension
They are heterogeneous in nature. They scatter a beam of light and hence show Tyndall effect. Examples of suspension are: sand in water, dusty air.
The size and behavior of particles play a crucial role in distinguishing between sol, solution, and suspension. A sol is made up of solid particles, ranging from 1 to 1000 nanometers, suspended in a liquid. It maintains its dispersion through Brownian motion, creating a stable colloidal system commonly seen in products such as ink or paint. Solutions, on the other hand, consist of molecular or ionic-sized particles that are evenly dispersed at a molecular level, with a size smaller than 1 nanometer. These mixtures are uniform and do not exhibit settling, as in the case of salt dissolved in water. Suspensions, in contrast, have larger particles measuring over 1000 nanometers and are heterogeneous in nature. The force of gravity causes these particles to settle, making them separable through filtration. This can be observed in examples like muddy water or sand particles in water. These distinct features, determined by particle size and behavior, define the unique characteristics of sol, solution, and suspension.