Concentration Terms

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Which concentration unit varies with temperature?

RankGuru · Accepted Answer

1. **Definition of Molarity ($M$)**: $M = \frac{	ext{moles of solute}}{	ext{Volume of solution in Litres}}$.
2. **Temperature Effect**: Matter expands upon heating and contracts upon cooling. Therefore, the **Volume** of a liquid solution changes as temperature varies.
3. **Result**: Since the denominator (Volume) changes while the numerator (moles) stays constant, **Molarity** is temperature-dependent.
4. **Mass-based terms**: Molality ($m = \frac{	ext{moles}}{	ext{mass of solvent}}$), Mole fraction, and Mass percent are based solely on **mass or moles**. 
5. **Conclusion**: Mass and moles are fundamental properties that do not change with temperature, making these units temperature-independent.

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