On what basis is a mixture of gases separated? Write the order in which nitrogen, oxygen and carbon dioxide will seperate from air.
Answers
Mixtures are substances consisting of two or more types of matter. Mixtures are two types – homogeneous mixture and heterogeneous mixture. In a heterogeneous mixture, the components are not uniformly distributed and there is no particle level homogeneity. Thus, we can easily separate a heterogeneous mixture into respective components of the mixture. Sieving, filtration, hand-picking, etc. are few common separation techniques used for the heterogeneous mixture. In the case of the homogeneous mixture and sometimes a heterogeneous mixture, we need to use special separation techniques. Evaporation, centrifugation, chromatography, sublimation, separating funnel, etc. are special separation techniques. Let’s see how to obtain different gases from the air.
Separation Techniques: Obtaining Gases from Air
We know that air is a homogeneous mixture of gases. It consists of gases like nitrogen, oxygen, carbon dioxide, argon, etc. in different proportion. Since it is a homogeneous mixture, we need special separation techniques. Fractional distillation is the technique that is used for obtaining different components from the air.
Fractional distillation is a separation method where the difference in boiling points of components is used to separate the liquid mixture into fractions through distillation. The process begins with the liquefaction of air. Let’s try to understand the process with the help of an illustration of separation of nitrogen from the air.
In order to obtain nitrogen gas from air, we need to remove the rest of the constituents of air. Before we start, air is filtered to remove the dust particles and then liquefied.