Molality
| Formula / Notation | m = moles solute / kg solvent; units: mol/kg (molal) |
|---|---|
| Also Known As | Molal concentration, m (molality), mol/kg, molality unit |
What is Molality?
A concentration unit defined as the number of moles of solute per kilogram of solvent (mol/kg), symbol m. Unlike molarity, molality does not change with temperature since it is based on mass rather than volume. Used in colligative property calculations.
Formula & Notation
Other Names / Synonyms: Molal concentration, m (molality), mol/kg, molality unit
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
A concentration unit defined as the number of moles of solute per kilogram of solvent (mol/kg), symbol m. Unlike molarity, molality does not change with temperature since it is based on mass rather than volume. Used in colligative property calculations.
Molality is used in: colligative property calculations, activity coefficient expressions in electrochemistry (Debye-Hückel theory uses molality), thermodynamic calculations of solution properties, and in the pharmaceutical and food industry when precise temperature-independent concentrations are req…
No direct safety concern for the unit. Misunderstanding whether a concentration is expressed as molality or molarity can lead to preparation errors. For dilute aqueous solutions, molality ≈ molarity in numerical value, but for concentrated solutions (especially in non-aqueous solvents or dense solve…
The formula or notation for Molality is: m = moles solute / kg solvent; units: mol/kg (molal)