⚗️Molarity Calculator
Molarity (M) is the concentration of a solution, defined as the number of moles of solute dissolved per litre of solution. It is the most commonly used unit of concentration in chemistry.
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Tip: Always add concentrated acid to water — never the reverse — to avoid dangerous exothermic splashing.
- 1Count moles of solute (mass / molar mass)
- 2Measure volume of solution in litres
- 3Molarity M = moles / litres
- 4To prepare a solution: weigh moles × molar mass of solute, dissolve, transfer to volumetric flask, add solvent to the mark
5.85g NaCl (M=58.5) in 500ml water=0.2 M NaCl solutionmoles=0.1; 0.1/0.5=0.2M
0.5 mol/L × 2L=1.0 mol solute neededn = M × V
| Solution | Approximate molarity |
|---|---|
| Seawater (NaCl) | 0.6 M |
| Blood (NaCl equivalent) | 0.15 M |
| Concentrated HCl | 12 M |
| Concentrated H₂SO₄ | 18 M |
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Fun Fact
The term "molar" derives from the Latin moles, meaning "heap" or "mass." Avogadro's number (6.022×10²³) defines how many particles are in one mole.
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