Skip to main content
Glite Dictionary
molality

molality

9.5
The number of moles of dissolved substance in one kilogram of liquid like water
  • noun
  • /moʊˈælɪti/
  • Specialized
translation icon : molalidad
  • In the lab, we prepared a solution with a molality of 2 moles per kilogram of water.

Examples

  • The molality of the saltwater solution was determined to be 0.5 moles per kilogram.

  • To calculate molality, you need to know the number of moles of solute and the mass of the solvent in kilograms.

  • We're going to use call something molality, molality.

Synonyms

concentration
vsmolality
  • Specialized
101 4.0

Amount of a substance in a liquid or solution

is specific to moles per kilogram of solvent rather than general amount
molal concentration
vsmolality
  • Specialized
8.6

The amount of dissolved substance in each kilogram of the liquid that holds it

has identical meaning but uses different wording

How Concentrated

saturated
  • Specialized
5 4.7
molality
  • Specialized
9.5
concentrated
  • Specialized
4.4
concentration
  • Specialized
101 4.0
to dilute
28 3.5

Surface Forms

molality singular
molalities plural

Morphology

molality = molal (opaque) = mol + al + ity

The word is formally built from 'molal' + '-ity', but the technical scientific meaning is not readily recoverable for an average learner from the form alone.

Etymology

Molality comes from the chemistry unit mole, meaning a set amount of particles, plus the ending -ity, which makes a noun ('quality' or 'state'). So molality literally means the 'amount of substance per mass', which is why it tells you how many moles there are for each kilogram of solvent and does not change with temperature.