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Record 1 2008-03-27


Subject field(s)
  • Metrology and Units of Measure
  • Analytical Chemistry
  • Environmental Studies and Analyses
Universal entry(ies)

Logarithm of the reciprocal of the hydrogen-ion concentration in a solution (-log10[H+]) used as a measure of the degree of acidity or alkalinity of this solution.


Roughly, pH can be divided into the following ranges: pH 0-2: Strongly acidic; pH 3-5: Weakly acidic; pH 6-8: Neutral; pH 9-11: Weakly basic; pH 12-14: Strongly basic. Under the Controlled Products Regulations, materials with pH values of 0-2 or 11.5-14 may be classified corrosive.


A pH of 7 is regarded as neutral (pure water), a pH less than 7 corresponds to an acid solution and a pH greater than 7 corresponds to an alkaline solution.


It should be noted that the pH scale is a logarithmic scale; a substance with a pH of 4 is more than twice as acid as a substance with a pH of 5. Similarly, a substance with a pH of 9 is much more than twice as alkaline as a substance with a pH of 8.


pH buffer solution, control, decline, diagram, electrode, gradient, indicator, limit, measurement, meter, modifier, probe, range, scale, unit, value.


  • Unités de mesure et métrologie
  • Chimie analytique
  • Études et analyses environnementales
Entrée(s) universelle(s)

Indice exprimant l'activité (ou la concentration) de l'ion hydrogène dans une solution à l'aide d'une échelle logarithmique.


Si le pH est inférieur à 7, la solution est acide; s'il est supérieur, elle est alcaline.


valeur de pH.


Campo(s) temático(s)
  • Metrología y unidades de medida
  • Química analítica
  • Estudios y análisis del medio ambiente
Entrada(s) universal(es)

Cologaritmo de la concentración de iones hidrógeno en una solución (-log10[H+]) utilizado como medida del grado de acidez o alcalinidad de esta solución.


Un pH de 7 se considera neutro (agua pura), un pH inferior a 7 corresponde a una solución ácida y un pH superior a 7 a una solución alcalina.


valor de pH.

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