Theory:

The majority of the substances are soluble in water. That is why water is referred to as a "Universal solvent."
 
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Universal solvent
However, some substances do not dissolve in water. As a result, other solvents, such as ethers, benzene, and alcohols, are used to prepare a solution by dissolving the substances.
 
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Some substances do not dissolve in water
 
Based on the type of solvent used solutions are classified into two types:
  • Aqueous solutions
  • Non-aqueous solutions
Aqueous solutions:
The aqueous solution is a solution in which water acts as a solvent.
Example:
Common salt in water, sugar in water, copper sulphate in water, and so on.
 
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Dissolving salt in water
  
Here in the above examples, the solvent is water, and the solute is common salt, sugar, copper sulphate, etc.
Non-aqueous solutions:
The non-aqueous solution is a solution in which any liquid other than water acts as a solvent.
Solvent other than water is considered a non-aqueous solvent. Non-aqueous solvents include alcohols, benzene, ethers, carbon disulphide, acetone, and others.
Example:
Iodine dissolved in carbon tetrachloride, sulphur dissolved in carbon disulphide, etc.
 
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Iodine does not dissolve in an aqueous solution
 
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Iodine dissolved in non-aqueous solution
 
Iodine dissolved in carbon tetrachloride: In this case, the solvent is carbon tetrachloride, and the solute is iodine.
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(a) Sulphur dissolved in \(CS_2\)
(b) Sulphur insoluble in water
 
Sulphur dissolved in carbon disulphide: The solvent is carbon disulphide, and the solute is sulphur.