The concentration of a solution can be expressed in molarity, normality, formality and molality. Among them, which mode of expression is the most accurate for the all conditions?

Molarity

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Formality

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Normality

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Molality

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Solution

The correct option is D Molality
Since molarity normality and formality are calculated against the volume of the solution and the volume of the solution changes with change in temperature. Therefore, these qualities do not remain constant with temperature

$Molality (m) = \frac{Moles of solute}{Mass of solvent (in kg)}$
The molality of a solution remains independent of temperature because it involves only mass, which is independent of temperature.

Hence, the correct option is $D$

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Q. Molarity, molality normality , formality

Q. Why is molality considered better for expressing the concentration as compared to molarity?

Q. _________ (Molarity/Molality) of a solution is expressed as mol/lit.

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$A$ $w / w$ (mass percentage)

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