What are examples of true solutions in chemistry?

Answer

Examples of true solutions, possible in all three states of matter, include liquids: sugar in water, sodium chloride in water, acetone in water; gases: oxygen and nitrogen (air); and solids: copper in zinc (brass) and tin in lead (steel), as detailed by Chemistry Explained. True solutions are homogeneous, meaning uniform composition and properties, with components that never separate spontaneously and can pass through the finest filters unchanged.

Encyclopedia Britannica explains that the term "solution" is most commonly applied to the liquid state of matter, but gases, solids and combinations of all three states are possible as true solutions. Examples of cross-state solutions are soda: carbon dioxide in water (gas to liquid); sulfur vapor in air (solid to gas); and dental fillings: mercury in silver (liquid to solid). In a solution, one substance is being dissolved, the solute, in the other substance, the solvent. The amount of solute that can be dissolved by the solvent is defined as solubility, explains Chem4kids. Water is considered a universal solvent, as it can dissolve a variety of substances. Chemistry Learning further defines a true solution, in addition to being homogeneous and non-filterable, as transparent in appearance and not displaying the Tyndall effect, which is a scattering of light due to larger particles present.

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