Question:
The concentration unit independent of temperature is:
The concentration unit independent of temperature is:
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Always remember: molality is mass-based (temperature independent), while molarity is volume-based (temperature dependent).
Updated On: Oct 7, 2025
- Normality
- Mass-volume percentage
- Molality
- Molarity
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The Correct Option is C
Solution and Explanation
Step 1: Recall dependence of concentration units.
- Molarity (moles of solute per litre of solution) depends on volume, and since volume changes with temperature, molarity changes with temperature.
- Normality is also based on volume, so it changes with temperature.
- Mass-volume percentage depends on solution volume, hence temperature dependent.
- Molality (moles of solute per kg of solvent) depends on mass, and mass does not change with temperature. Thus, molality is independent of temperature.
Step 2: Conclusion.
Therefore, the concentration unit that is independent of temperature is molality.
Final Answer: \[ \boxed{\text{(C) Molality}} \]
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