22.Fractional crystallization is a method of refining substances based on differences in solubility. Zone refining is a group of similar methods of purifying crystals, in which a narrow region of a crystal is molten, and this molten zone is moved along the crystal (in practice, the crystal is pulled through the heater).
answer no 2
2 . Difference in solubility of glucose and fructose in a particular solvent. Their Solubility in a particular solvent at different temperatures. And their separation by filtration.
Fractional distillation is a technique for the separation of miscible liquids. It is a distillation technique used for the separation of liquids which dissolve in each other. Fractional distillation is a process of separating the components of a mixture by repeated distillations and condensations.
➡️ Fractional distillation is based on the principle that different liquids have different boiling points. In the fractional distillation, a fractionating column is used.
Fractional distillation column is a fractionating column used for the separation of miscible liquids. It is a long glass tube with wide bore. It either filled with glass beads, small stones, porcelain rings or coke. It can also be blown in to a shape with several spheres or pear bulbs. The purpose of the glass beads is that they improve the distillation process.
REGARDS, ARNAB ✌️
»» In fractional crystallization is a method of seperating substances on the basis of their solubility
»» If mixture of two or more substances are allowed to crystallize by allowing the temperature to increase or decrease,then the precipitate formed will contain more of the least soluble substance
»» The proportion of the componente present in the precipitate depends on their solubility product
»» If the solubility products are similar we may have to use a cascade process for complete seperation
»» We usually use this technique in chemical engineering to obtain pure metal
answer- The above question is from the chapter 'Is Matter Around Us Pure?'.
Let's know about Fractional Distillation first.
¤ Principle- 1. Two or more than 2 miscible liquids should be there.
2. Difference in boiling points should be less than 25°C/25 K.
3. Liquids shouldn't decompose on heating.
¤ Industrial Applications- 1. To separate chloroform and benzene.
2. To separate Ethyl Alcohol from water.
3. To separate components of petroleum.
4. To separate components of air.
¤ Diagram- (The diagram has been attached.)
Given question: What is the basic principle behind fractional distillation?
1. The difference in boiling point of two or more miscible liquids is less than 25 K.
2. The difference in boiling point of two or more miscible liquids is more than 25 K.
3. The difference in molecular weight of two or more miscible liquids should be 50g/mol.
4. The liquid should decompose during the process of fractional distillation.
For fractional distillation, difference in boiling points should be less than 25°C/25 K.∴ 1 is the correct option.
it is the main principle of the fractional distillation
you can use raults law to separate the mixtures using fractional distillation
Fractional distillation is a process by which individual components can be separated using heat from a given mixture. The boiling points of each component in the mixture determine the order of separation. Common uses of fractional distillation include the production of distilled water, and gasoline from crude oil.
Fractional distillation is the separation of a mixture into its component parts, or fractions. Chemical compounds are separated by heating them to a temperature at which one or more fractions of the mixture will vaporize. It uses distillation to fractionate. Generally the component parts have boiling points that differ by less than 25 °C (77 °F) from each other under a pressure of one atmosphere. If the difference in boiling points is greater than 25 °C, a simple distillation is typically used.
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