Molális

Molális refers to a concentration unit used in chemistry. It is defined as the number of moles of a solute divided by the mass of the solvent in kilograms. The symbol for molality is 'm'. For example, a solution with a molality of 1 mol/kg means that there is one mole of solute dissolved in one kilogram of solvent.

Molality is often used in calculations involving colligative properties, such as boiling point elevation, freezing point depression, and osmotic pressure. These properties depend on the number of solute particles in a solution, rather than their chemical identity. Molality is a preferred unit for these calculations because it is independent of temperature. Unlike molarity, which is defined as moles of solute per liter of solution and changes with temperature due to volume expansion or contraction, molality remains constant as temperature fluctuates.

The unit of molality is moles per kilogram (mol/kg). When expressing molality, it is common to use the symbol 'm' followed by the numerical value. For instance, a 0.5 molal solution of sodium chloride would be written as 0.5 m NaCl. Understanding molality is crucial for accurately predicting and quantifying the behavior of solutions in various chemical and physical processes.