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Examples of Miscible Liquids

We know that all matter can exist in three possible states which are different from each other in their arraignment of particles. Solid states are compact with a regular arrangement of particles whereas liquid particles have more kinetic energy compare to gaseous state. The properties of liquid state are almost intermediate of solid and gaseous state. Two liquids can show different chemical and physical properties.

On the basis of their properties, liquids can be separated from their mixtures. There are several methods for the separation of liquids from their mixtures. For example fractional distillation is used to separate liquids on the basis of their boiling points whereas chromatography is used to separate coloured compounds. The mixtures of liquids can be classified in two types; miscible and immiscible. Immiscible liquids form two separate layers and cannot mix with each other.

In such mixtures, the attraction force between the molecules of same liquid is too strong and requires a large amount of energy which cannot be released by when the two liquids mix. The polarity in liquids determines their mixing tendency with other liquids.
A polar molecule has two ends, positive and negative end attract the opposite ends to form strong inter-molecular bonds. On the contrary, non-polar liquids have weak van der Waals forces of attraction between them. Liquids of same polarities are mixed together to form miscible liquids such as mixture of alcohol with water are an example of miscible liquid. But molecules with low polarity cannot mix together and form immiscible liquids. For example oil and water don't mix with each other and form two separate layers with each other. But pouring alcohol into water forms a single liquid phase with not meniscus between both liquids. Some liquids are partially miscible with each other such as mixture of butanol in water.

Another example of miscible liquids is the mixture of di-chlormethane and chloroform or milk and water.  It is difficult to separate two miscible liquids by simple physical methods. Usually fractional distillation is used to separate miscible liquids as they have different boiling points.

Oil and water is the classic example of immiscible liquids. Since water is a polar molecule with one positive and negative ends, but oil is a non-polar molecule with long hydrocarbon chain. Therefore both cannot mix with each other to form a mixed phase. Similarly the mixture of pentane and acetic acid is an example of immiscible liquids.  The mixing of molten silver and lead is used to separate silver form lead in Parkinson’s method.

The mixture of iron sulphides and silicates in magma is an immiscible liquid. Both of these compounds; FeS and silicate do not mix due to less Gibbs free energy of minerals compare to the Gibbs free energy of mixing. All polar liquids are miscible with each other and miscible in water as well. Water acts as a good solvent for all the polar liquids. Miscibility of liquids makes homogenous mixtures. Same term can also be used for solid and gaseous states.

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From Wikipedia

Miscibility - Wikipedia, the free encyclopedia

1 Organic compounds; 2 Metals; 3 Effect of entropy; 4 Determination; 5 See also ... There are examples of immiscible metals in the liquid state. ...


From Encyclopedia

liquid

liquid one of the three commonly recognized states in which matter occurs, i.e., that state, as distinguished from solid and gas, in which a substance has a definite volume but no definite shape. Properties of Liquids In general, liquids show expansion on heating, contraction on cooling; water, however, does not follow the rule exactly. A liquid changes at its boiling point to a gas and at its freezing point, or melting point , to a solid. The boiling point is especially important because, since liquids change their states at different temperatures, those in a mixture can be separated from one another by raising the temperature of the mixture gradually so that each component in turn undergoes vaporization at its boiling point. This process is known as fractional distillation. Liquids, like gases, exhibit the property of diffusion. When two miscible liquids (i.e., they mix without separation) are poured carefully into a container so that the denser one forms a separate layer on the bottom, each will diffuse slowly into the other until they are thoroughly mixed. Liquids, like gases, differ from solids in that they are fluids, that is, they flow into the shape of a containing vessel. Liquids exert pressure on the sides of a containing vessel and on any body immersed in them, and pressure is transmitted through a liquid undiminished and in all directions. Liquids exert a buoyant force on an immersed body equal to the weight of the liquid displaced by the body (see Archimedes' principle and specific gravity ). Unlike gases, liquids are very nearly incompressible, and for that reason are useful in such devices as the hydraulic press. Liquids are useful as solvents. No one liquid can dissolve all substances; each takes into solution only certain specific substances. Molecular Structure of Liquids The molecules (or atoms or ions) of a liquid, like those of a solid (and unlike those of a gas), are quite close together; however, while molecules in a solid are held in fixed positions by intermolecular forces, molecules in a liquid have too much thermal energy to be bound by these forces and move about freely within the liquid, although they cannot escape the liquid easily. Although the molecules of a liquid have greater cohesion than those of a gas, it is not sufficient to prevent some of those at the free surface of the liquid from bounding off (see evaporation ). On the other hand, the cohesive forces between the molecules at the surface of a mass of liquid and those within cause the free surface to act somewhat like a stretched elastic membrane; it tends to draw inward toward the center of the liquid mass, to draw the liquid into the shape of a sphere, thus exhibiting the phenomenon known as surface tension . A liquid is said to "wet" a solid substance when the attractive force between the molecules of the liquid and those of the solid is great enough to hold the liquid's molecules at the solid surface. For example, water "wets" glass since its molecules cling to glass surfaces, whereas mercury does not since the adhesive force between its molecules and those of glass is not strong enough to hold them together. Capillarity is an example of surface tension and adhesion acting at the same time.


From Yahoo Answers

Question:Please no obvious ones like water+oil, milk+water etc.

Answers:have you tried adding more eyes in there..?

Question:I have some science homework, and it says What is a miscible liquid? Give an example... What is a immiscible liquid? Give an example... But I don't even know what a miscible liquid is, so if anyone can help please do. Also does anyone know if you poured a little of an immiscible liquid into a test tube containing water what would you see? Thanks. Thank you!

Answers:A liquid is said to be miscible if it dissolves completely in another liquid and is difficult to separate like alcohol is miscible in water An immiscible liquid is one which does not dissolve but forms a layer over another liquid and can be separated easily like oil is immiscible in water if you poured a little of an immiscible liquid into a test tube containing water you would see that it forms a thin layer above the water

Question:This is for integrated science 9 th grade, i need help, book does not explain to well.Please, please, help! test

Answers:Two liquids mix with each other if they are of similar nature. The important critirea is they must be able to develope H-bonds between them ie .there must be intramolecular H-bonding. For ex. Water and Ethanol mix with each other due to H-bonding. Water and Benzene do not mix as H-bonds donot exist between them.

Question:

Answers:In chemistry, miscibility is the property of liquids to mix in all proportions, forming a homogeneous solution. In principle, the term applies also to other phases (solids and gases), but the main focus is on the solubility of one liquid in another. Water and ethanol, for example, are miscible since they mix in all proportions. By contrast, substances are said to be immiscible if in some proportion, they do not form a solution. For example, diethyl ether is fairly soluble in water, but these two solvents are not miscible since they are not soluble in all proportions. :):):)

From Youtube

miscible liquid separation :video showing separation of different liquids. We are showing the process thru flash

Miscible and Immiscible Liquids :