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Mélange tampons

Rappel

Comment peut-on calculer le  pH de sel d’AF et de Bf ? 

Motivation

Comment appelle-t-on autrement l’association  entre plusieurs substances ?

Annonce du sujet

Qu'allons nous étudier aujourd'hui ?

Analyse

a. Définition : 

b. Sorte

1. Mélange tampons  acide

Combien  de types de tampons distingue-t-on ? citez –les.

 

On calcule le pH de sel d'Af et de Bf par la formule PH =7- ½ pkb - ½ log cs.

Autrement l'association entre plusieurs substances s'appelle mélange.

Aujourd'hui nous allons étudier le mélange tampon.

a. Définition : ce sont les mélanges dont le pH varie peu par addition de quantité plus ou moins importante d’acide fort ou de base faible.

a. Sorte

On distingue deux types de mélanges tampons.

1. Mélange tampons  acide

C’est le mélange  d’acide faible et son sel de base forte.

Nous avons 2 Types de tampons qui sont :

  • Tampons  acide.
  • Tampons basique.
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