Respuesta :
When a solution is heated the concentration term that remains unchanged is Molality and the concentration term that changes is Molarity.
As the solution is heated the temperature increases and so does the volume. Molarity is a volume dependent concentration and so it changes as volume or temperature changes. Thus, it is also considered as an inaccurate measure of concentration.
Molality on the other hand is a mass dependent quantity which is further independent of temperature and act as an accurate measure of concentration. As the temperature increases it has no effect over the concentration term molality.
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Answer: Molality remains unchanged when the solution is heated.
Explanation: The molality is expressed in units of moles per 1000g of solvent.
Hence, upon heating the volume of the solution is changed and hence molarity and normality being dependent on the volume of the solution will change while molality which only depend on the mass of the solvent will remain unchanged.
The molality of the solution does not change with change in temperature.
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