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A solution is a homogeneous mixture of two (or more) substances, the composition of which may vary between certain limits. This concept is valid if we take the example of alcohol and water i.e. both the substances are in same phase. But what about sugar syrup, which contains 60% sugar and 40% water? Will the sugar be the solvent? Answers is No, Still the sugar is solute. Then what is the right definition for this case. Well, for heterogeneous substance,
Solvent is that component of the binary mixture which is in same physical state as the solution will be.
A solution consisting of two components is called binary solution. The component which is present in large quantity is called solvent and the component which is small in quantity is called solute. If both components are in same physical state.
All the three states of matter (gas, liquid or solid) may behave either as solvent or solute. Depending on the state of solute or solvent, mainly there may be the following seven types of binary solutions.
S.No.
Solute
Solvent
Example
1
Gas
Air
2
Liquid
Aerated water (CO2 + H2O)
3
Solid
Hydrogen in palladium
4
Alcohol in water, benzene in toluene
5
Mercury in zinc amalgam
6
CO2 dissolved in water
7
Sugar in water, common salt in water
8
Smoke
9
Various alloys
This chapter besides being simple is very important too especially the section dealing with Raoult’s Law , Colligative properties and Van’t Hoff Factor. It begins with modes of expression of strength of solution, followed by vapour pressure of solution, ideal and non ideal solutions, we shall see, how vapour pressure changes with composition (mole fraction) of the components present in the solution. Here, we concentrate only on binary solutions, we shall therefore often be able to simplify equations by making use of relation XA + XB = 1, we shall also discuss the properties of solutions which depend upon number of particles of solute (called Colligative Properties) using non volatile solutes and abnormal results due to association or dissociation of electrolytic solute. We will have the systematic study of solution chemistry under following sub topics.
Solubility
Raoult’s Law
Colligative Properties
Abnormal Colligative Properties
Solved Examples
Refer to the syllabus of IIT JEE
Look here for past year papers of IIT JEE to have an idea about the type of questions asked in exam
Click here to refer the solved examples on solutions
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