Does molality or molarity vary with temperature, or are they both temperature independent?
Molarity = # mols/L. # mols = grams/molar mass. The mass of a solute doesn't change with temperature. But volume will; therefore, molarity will change as the density of solvent changes with temperature.
Molality = # mols/kg solvent. In light of the preceding paragraph, do you think molality will change with termperature?
no because it is the ratio of no of moles of solute and mass of solvent in kg so mass remain constant at any termperature and molality will not change with termperature.
Both molality and molarity are temperature independent.
Molality (symbolized as "m") is a measure of the concentration of a solute in a solvent on the basis of the amount of solute in moles per kilogram of solvent. It is independent of temperature because it only considers the mass of the solvent, not its volume. Therefore, changes in temperature do not affect the molality value.
Molarity (symbolized as "M") is a measure of the concentration of a solute in a solution on the basis of the amount of solute in moles per liter of solution. Like molality, it is also temperature independent. Molarity takes into account the volume of the solution and the amount of solute, but not the temperature. Therefore, changes in temperature do not impact the molarity value.
It is important to note that while molality and molarity are temperature independent, they can be affected by changes in temperature indirectly. For example, when a solute dissolves in a solvent, the volume of the solution may change due to thermal expansion or contraction. This can lead to a change in the concentration expressed in terms of volume. However, the concentration expressed in terms of molality or molarity remains constant.