Rakesh Garhwal

Qualitative and Quantitative Analysis Separation Techniques   Why Do We Need to Separate Substances? Most substances occurring in nature are mixtures. To obtain pure substances, it is necessary to separate the components of the mixtures. For example, seawater is the mixture of water and salt. If we want to use water and salt separately, then we have to separate the salt from the water. Pure substances have great importance in chemical industries. These are used in laboratories to study their chemical properties. Components of heterogeneous mixtures can sometimes be separated very easily as the components are physically distinct from each other. For example, methods like handpicking, filtering, sieving etc., can be used to separate the components. However, to separate the components of a homogeneous mixture, we need to use some special separating techniques. The commonly used techniques for separating the components of mixtures are as follows: Evaporation Centrifugation Separation o...