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PH SCALE UNIT [1 record]

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Record 1 1982-08-10

English

Subject field(s)
  • Analytical Chemistry
  • Electrolysis (Electrokinetics)
  • Metrology and Units of Measure
CONT

The hydrogen-ion concentration and the hydrogen-ion activity of most solutions is a small number that can be expressed in exponential form. In order to eliminate the use of exponential numbers in expressing hydrogen-ion concentration, S.P.L. Sorensen in 1909 introduced the concept of pH .... This table brings out certain characteristics of the pH unit. A neutral solution has a pH of 7, acid solutions have a pH less than 7, and basic solutions have a pH greater than 7.

French

Domaine(s)
  • Chimie analytique
  • Électrolyse (Électrocinétique)
  • Unités de mesure et métrologie
CONT

En unités de pH, l'activité du proton s'exprime en chiffres plus simples. Ainsi, une solution dans laquelle l'activité du proton est égale à 10-5 mole par litre aura un pH de 5. C'est cette commodité d'écriture qui incita (...) S.P.L. Sorensen à proposer, en 1909, une échelle logarithmique, dite échelle de pH, pour la concentration des protons dans l'eau.

Spanish

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