Effective Molality
| Formula / Notation | m_eff = i × m (van't Hoff factor) |
|---|---|
| Also Known As | van't Hoff molality; corrected molality; i × m; particle-corrected molality |
What is Effective Molality?
Effective molality accounts for the actual number of particles produced when a solute dissolves, by multiplying the nominal molality (m) by the van't Hoff factor (i). For electrolytes, i > 1 because dissociation produces more particles than formula units. It is used to calculate accurate values of colligative properties such as boiling point elevation and freezing point depression.
Formula & Notation
Other Names / Synonyms: van't Hoff molality; corrected molality; i × m; particle-corrected molality
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
Effective molality accounts for the actual number of particles produced when a solute dissolves, by multiplying the nominal molality (m) by the van't Hoff factor (i). For electrolytes, i > 1 because dissociation produces more particles than formula units. It is used to calculate accurate values of colligative properties such as boiling point elevation and freezing point depression.
Accurate calculation of colligative properties for electrolyte solutions; osmotic pressure calculations in biological systems; cryoscopy and ebullioscopy with salt solutions; pharmaceutical formulation
No direct hazard — a solution chemistry concept.
The formula or notation for Effective Molality is: m_eff = i × m (van't Hoff factor)