Question

Out of molarity and molality, which one is preferred and why?

Answer 1

hello mate !

answer

Molality  

solotion

is no of moles of solute dissolved in 1kg of solvent. While Molarity is no of moles of solute dissolved per litre of solution. As Molality involves mass and molarity involves volume…. As volume changes with temperature but mass doesn't……that's why Molality is preferred over molarity to express concentration.

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Answer 2

hii mate, here's ur ans

volume of a substance is dependent on the temperature and pressure of the substance and thus keeps changing. Therefore, due to a need of a reasonable and trustworthy concept of moles to preserve the solution, molality is preferred over molarity. The reason for the preference of molality over molarity is simple.
hence molality is preferred