In which mode of expression, the concentration of a solution remains independent of temperature? (IIT-JEE, 1988)
A
Molarity
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B
Normality
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C
Formality
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D
Molality
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Solution
The correct option is D Molality Molarity, normality, and formality are calculated against the volume of the solution. The volume of the solution changes with change in temperature; therefore, these quantities do not remain constant with temperature.
Molarity (m) =MolesofsoluteMassofsolventinkg
The molality of a solution remains independent of temperature because it involves only mass, which is independent of temperature.