
What are the different ways of expressing the concentration of the solution?
Hint: Start this question by defining concentration and then its units. After this, write different methods for calculation of concentration of a solution and interconnect them.
Complete answer:
The Concentration of a Solution is defined as the relative amount of solute present in a solution.
Methods of Expressing Concentration of Solutions are as given below –
1. Percentage by weight
Symbol: (W / W %)
Definition: “It is the amount of solute present in 100 g of solution”.
Formula:
Unit: unitless
2. Percentage by volume
Symbol: (V / V %)
Definition: “It is defined as the volume of solute present in 100 mL of solution”.
Formula:
Unit: unitless
3. Weight by volume
Symbol: (W / V %)
Definition: “It is defined as the amount of solute present in 100 mL of solution”.
Formula:
Unit: g/L
4. Mole fraction
Symbol:
Definition: “It is the ratio of the number of moles of solute and the total number of moles of solute and solvent”.
Formula:
Unit: unitless
5. Parts per million
Symbol: ppm
Definition: “It is defined as the parts of a component per million parts (
Formula:
Unit: ppm
6. Molarity
Symbol: M
Definition: “Molarity of any solution is the number of moles of solute per litre of solution”.
Formula:
Unit: mol/L
7. Molality
Symbol: m
Definition: “Molality of any solution is represented as the number of moles of solute present per kg of solvent”.
Formula:
Unit: mol/kg
8. Normality
Symbol: N
Definition: “It is defined as the gram equivalent weight per litre of solution”.
Formula:
Unit: gram equivalent/ L.
Note: Concentration is basically a measure to find the amount of solute present in a solvent which together forms a solution.











