Molality
Molality
Molality (/moʊˈlælɪti/ moe-LAL-ih-tee) is a measure of the concentration of a solute in a solution in terms of amount of substance in a specified amount of mass of the solvent. This contrasts with the definition of molarity which is based on a specified volume of solution.
Etymology
The term "molality" comes from the word "mole", a unit of measurement in chemistry for the amount of a substance, and the suffix "-ality", which is used to form nouns from adjectives, particularly in scientific terminology.
Definition
Molality is defined as the number of moles of solute per kilogram of solvent. It is usually expressed in moles per kilogram (mol/kg). The solute does not have to be in liquid form. The solvent is usually a liquid, but can also be a solid or gas.
Calculation
The molality (m) of a solution is calculated using the formula:
m = n/V
where:
- n is the number of moles of solute
- V is the volume of the solvent in liters
Related Terms
- Molarity: A measure of the concentration of a solute in a solution, defined as the number of moles of solute per liter of solution.
- Mole (unit): The base unit in the International System of Units (SI) for amount of substance.
- Solute: The minor component in a solution, dissolved in the solvent.
- Solvent: A substance that dissolves a solute, resulting in a solution.
See Also
External links
- Medical encyclopedia article on Molality
- Wikipedia's article - Molality
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