Molarity (Concentration)
Moles of solute per litre of solution.
M = \dfrac{n}{V}
1What it means
Molarity measures how concentrated a solution is. A 1 M solution has one mole of solute dissolved per litre of solution.
2Variables
| Symbol | Meaning |
|---|---|
| M | Molarity (mol/L) |
| n | Moles of solute |
| V | Volume of solution (L) |
3Worked examples
Example 1 Worked solution
Q. Find the molarity of 0.5 mol NaCl in 2 L of solution.
- M = n / V = 0.5 / 2.
✓ M = 0.25 mol/L
4Where it's used
- ✦Preparing standard solutions in chemistry.
- ✦Dilution and titration calculations.
5Tips & common mistakes
- !Volume is in litres of solution, not just solvent.
- !Convert mL to L by dividing by 1000.