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Chemistry / Is Matter Around Us Pure / Types of Mixtures

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Types of Mixtures

A mixture is a substance which consist of two or more elements or compounds not chemically combined together.

Depending on nature of components, mixture can be of two types:

Homogeneous Mixture: It is a mixture in which the constituents are uniformly distributed, that is it has same composition throughout. E.g. salt dissolves in water to form a homogeneous mixture. Most homogeneous mixtures are called solutions like tea, coffee etc.

Heterogeneous Mixture: It is a mixture in which the constituents do not get mixed uniformly. E.g. sand and sawdust form a Heterogeneous mixture.

Types of Mixtures:

Mixtures can be categorized into various types, depending on the physical states of the constituents. Some of these types are discussed here.

Solid - Solid mixture : A mixture of sodium chloride (solid) and ammonium chloride (solid) and a mixture of sugar (solid) and sand (solid) are examples of solid—solid mixtures.

Solid - Liquid mixture : A mixture of common salt (solid) and water (liquid) is an example of a solid—liquid mixture. A mixture of iodine in ethanol (tincture of iodine) is also a solid—liquid mixture.

Solid - Gas mixture: Air entrapped in the pores of soil particles is an example of this type of mixture.

Liquid - Gas mixture : All gases are partially miscible with liquids. When a gas, such as hydrogen, oxygen or nitrogen is brought into contact with water, a small amount of the gas dissolves to form a mixture.

Gas - Gas mixture : All gases mix together, provided they do not react chemically. For example, hydrogen and oxygen gases mix together in all proportions. Air is a mixture of several gases.

Liquid - Liquid mixture : Examples of liquid—liquid mixtures are water—alcohol mixture and water-oil mixture.

Some Useful Mixtures :

Milk is not a pure substance. It is made of water, fat, proteins, etc.

Ink is a mixture made of water and one or more dyes.

Soft drinks (lemonade, soda water, etc.) that you see in your daily life are also not pure substances but are homogeneous mixtures.

Tincture of iodine which is used as an antiseptic is a mixture of iodine and ethanol.

Air is a mixture of oxygen, nitrogen, carbon dioxide, water vapour, etc.

An alloy is a homogeneous mixture, of a metal and other metal(s) or nonmetals. Brass is an alloy of copper and zinc. Gold has to be alloyed with silver and copper to make it hard enough for making jewelleries and ornaments.

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