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equilibrium constant

equilibrium constant

5.5
A number showing the amount of products compared with reactants when a chemical reaction stops changing
  • noun
  • /ˌiːkwɪˈlɪbriəm ˈkɒnstənt/
  • Specialized
translation icon : constante de equilibrio
  • And here are different people who measured it either by equilibrium constant or by isothermal calorimetry.

So here we're relating equilibrium constants and rate constants.

Examples

  • Understanding the equilibrium constant Kc helps predict how far a chemical reaction will proceed before reaching equilibrium.

  • That's how we are using the equilibrium constant, no, OK.

  • So here we're relating equilibrium constants and rate constants.

  • Now, if that's what you want to make, there's a problem because aldehydes, you know, have an equilibrium constant about one with water.

  • Finally, it's enormously valuable to have a feel for a few key numbers, foremost among which may be the relationship between equilibrium constant and free energy; knowing this tells you, for instance, that it takes only a difference of 1.8 kcal/mol of free energy between two conformers to almost completely shift the conformational equilibrium to the side of the more stable one.

    Blog text (7)
  • The separation factor for the isotope exchange reaction R2 is simply its equilibrium constant, which is in turn related to the reaction free energy: Formula omitted Formula omitted is calculated according to Formula omitted.

    Academic text (2018)
  • The equilibrium constant Kc determines the ratio of products to reactants in a reversible reaction at equilibrium.

  • Chemists use the equilibrium constant Kp to express the relationship between partial pressures and concentrations in gaseous reactions.

Surface Forms

Morphology

equilibrium + constant

The phrase is compositionally understandable: 'equilibrium' (a state where concentrations are steady) combined with 'constant' (a fixed value) naturally suggests a fixed value associated with equilibrium. However, the precise scientific sense — a specific numerical ratio of product to reactant concentrations — is technical and not fully predictable for a B1 learner without subject knowledge, so only partial transparency applies.

Etymology

Equilibrium constant comes from the image of a simple scale where products sit on one side and reactants on the other until they reach a steady 'balance'. The word equilibrium means this balance and constant means a fixed number, so the term is the number that tells how much product there is compared with reactant when the reaction is balanced.