Question:
Which of the following modes of expressing concentration of solution does not depend upon temperature ?
Which of the following modes of expressing concentration of solution does not depend upon temperature ?
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If the concentration unit has “per litre”, it’s temperature-dependent; if it has “per kilogram”, it’s temperature-independent.
Updated On: Oct 16, 2025
- Molarity
- Normality
- Formality
- Molality
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The Correct Option is D
Solution and Explanation
Step 1: Temperature dependence idea.
Quantities based on volume change with temperature (thermal expansion/contraction), whereas quantities based on mass do not.
Step 2: Analyze options.
Molarity (mol L\(^{-1}\)), Normality (eq L\(^{-1}\)), and Formality (mol formula units L\(^{-1}\)) all use \emph{volume} of solution \(\Rightarrow\) temperature dependent.
Molality (mol kg\(^{-1}\) solvent) uses \emph{mass} of solvent \(\Rightarrow\) independent of temperature.
Step 3: Conclusion.
Hence the temperature-independent concentration unit is Molality (D).
Quantities based on volume change with temperature (thermal expansion/contraction), whereas quantities based on mass do not.
Step 2: Analyze options.
Molarity (mol L\(^{-1}\)), Normality (eq L\(^{-1}\)), and Formality (mol formula units L\(^{-1}\)) all use \emph{volume} of solution \(\Rightarrow\) temperature dependent.
Molality (mol kg\(^{-1}\) solvent) uses \emph{mass} of solvent \(\Rightarrow\) independent of temperature.
Step 3: Conclusion.
Hence the temperature-independent concentration unit is Molality (D).
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