TERMIUM Plus®

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OH CONCENTRATION [3 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2004-03-03

English

Subject field(s)
  • Chemistry
  • Food Additives
  • Biotechnology
DEF

A solution to which moderate amounts of either a strong acid or base may be added without causing any large change in the pH value of the solution. Such solutions usually contain (a) a weak acid and a salt of the weak acid, (b) a mixture of an acid salt with the normal salt, or (c) a mixture of two acid salts.

CONT

For many situations, it is desirable to maintain the H+ and OH-concentration of a water solution at low and constant values. A useful device for this is a mixture of weak acid and its anion(or of a weak base and its cation). Such a mixture is called buffer.

French

Domaine(s)
  • Chimie
  • Additifs alimentaires
  • Biotechnologie
DEF

Mélange de solutions dont le pH ne s'altère pratiquement pas au cours d'une dilution. On prend généralement le mélange d'un acide fort (ou d'une base forte) avec un sel organique. Toute variation du pH y provoque une réaction tendant à restaurer l'équilibre primitif.

OBS

pluriel : des solutions tampons (d'après le Dictionnaire de la chimie de Duval, 1978, p. 985).

Spanish

Campo(s) temático(s)
  • Química
  • Aditivos alimentarios
  • Biotecnología
DEF

Aquella cuyo pH se mantiene casi constante al añadir una cantidad moderada de un ácido o de una base.

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Record 2 2000-10-25

English

Subject field(s)
  • Chemistry
OBS

The degree of concentration of free hydroxyl ions(OH) capable of forming an alkali, ie, a solution with pH higher than 7.

French

Domaine(s)
  • Chimie
OBS

Degré de concentration d'ions (OH) libres, capables de former un alcali, c'est-à-dire une solution dont le pH est supérieur à 7.

Spanish

Save record 2

Record 3 1989-12-18

English

Subject field(s)
  • Biological Sciences
CONT

Specific-acid and specific-base catalysis are defined as rate enhancements proportional only to the concentration of H+ or OH- ions, respectively. General-acid and general-base catalysis are rate enhancements that are proportional to the concentration of general acids and general bases, i. e., proton donors and proton acceptors, respectively, as defined by J. N. Bronsted and T. M. Lowry.

French

Domaine(s)
  • Sciences biologiques
CONT

Quand la vitesse de la réaction catalysée dépend directement de la propriété "donneur" ou "accepteur" de proton du catalyseur, on dit, qu'il s'agit de réactions à catalyse-acide ou catalyse-basique respectivement. Quand une variété d'acides ou de bases peut agir catalytiquement dans une réaction donnée, on dit qu'il s'agit d'une catalyse générale acide ou d'une catalyse générale basique.

Spanish

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