2. Is Matter Around Us Pure
Properties of solutions
A solution is homogeneous in nature.
The solute particles in a solution easily pass through a filter paper. Thus, a true solution passes through a filter paper.
The solute particles in a solution cannot be seen by naked eyes.
The properties of solute are retained in the true solution. Thus a sugar solution is sweet in taste and a solution of salt in water is saline in taste.
A true solution does not scatter light and hence does not show tyndall effect. In other words, solutions are transparent to light.
The solute particles in a solution do not settle on keeping.
The diameter of solute particles in a solution is about 10–9 m.
Types of solutions
Solution of solid in a solid : Metal alloys are the solutions of solids in solids.
Example. Brass is a solution of zinc in copper. Brass is prepared by mixing molten zinc with molten copper and cooling their mixture.
Solution of solid in a liquid : This is the most common type of solutions. Sugar solution and salt solution are the solutions of solids in liquids. A solution of iodine in alcohol called ‘tincture of iodine’ is also a ‘solid in a liquid’ type of solution. This is because it contains a solid (iodine) dissolved in a liquid (alcohol) solution.
Solution of liquid in a liquid : Vinegar is a solution of acetic acid (ethanoic acid) in water
Solution of gas in a liquid : Soda-water is a solution of carbon dioxide gas in water
Solution of gas in a gas : Air is a solution of gases like oxygen, argon, carbon dioxide and water vapour, etc., in nitrogen gas. Nitrogen is the solvent in air and all other gases are solutes.
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