Question
Laboratory: Separating Mixtures A mixture is a substance that comprises that are physically intermingled two or more elements and/or compounds but have not reacted chemically to formmew s mixture may be a solid, liquid, gas, or some combination of those states We by mixtures.both in the lite. The air we breathe is a mixture of nitrogen amounts of other gases. Our are complex motures of oxygen and small compounds water sugar dioxide and various organic that provide the color and flavor. The foods we eat are complex mixtures of organic and inorganic compounds. Mixtures are often created intentionally because a particular mixture possesses special desirable characteristics. For example, stainless steels are mixtures of iron.chromium. carbon, nickel, manganese and other elernentsnspectic proportions, chosen to optimize such characteristics as resistance to corrosion hardness tensile strength, color, and lust Similarly concretes are complex mixtures of components chosen to minimize cost while optimizing strength, durability. resistance to road salts, permeability to water, and other factors, depending on the purpose for which the concrete will be used. Because the companerts of a mixture have not reacted chemically. it is possible to separate the mixture into its component substances by using purely physical means. Chemists have devised numerous methods for separating compounds based on differential physical characteristics, including differential solubility. distillation, recrystallization. solvent extraction, and chromatography. In this chapter, we'll examine these common methods of separating mixtures. Chapter 6 Laboratory. Separating Motues
Explanation / Answer
1) The final masses of sand and sucrose can be lighter or lower than the initial masses due to any of
following reasons:
(i) determining the weight before the sucrose is completely dissolved i.e) improper mixing.
(ii) quantities lost during transfer of materials before weighing.
(iii) The sand might contain impurities such as salts which dissolve in water
2) If we do not have any means of filtering agents then we can remove salts from sand by using various
solvents depending upon the solubility properties of that salt in certain solvent.
3) If 2 compounds are soluble in the solvent then you can evaporate the solution and filter according to
differences in their sizes.
