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Acido-alcalimétrie
Domaine Science Sous domaine Science
Section Scientifique Option Biologie Chimie
Discipline Chimie Classe 6ème
Matériel didactique Craies de couleur Auteur SCHOOLAP.COM
Objectif opérationnel A l’issue de la leçon, l’élève sera capable de définir l’acidimétrie en se basant sur le principe volumétrique et utiliser toutes les formules données lors d’un exercice.
Réference notion chimie 6, ed mediaspaul, page 33. Maîtriser la Chimie 4, Ed Loyala, page 29.
Activité initiale

Rappel

Que consiste le dosage volumique ?

Rappel

Cette méthode consiste à déterminer le volume de la solution titrée nécessaire pour réagir complétement avec la substance à doser contenue dans un volume.

Quand est-ce qu'on constate que la solution à doser est au PE ?

Quand est on constate que la solution à doser est au PE ?

Motivation

Comment est cet acide HCl et cette base NaOH?

Motivation

HCl est un acide fort et NaOH est une base forte.

Annonce du sujet

Qu'allons-nous voir aujourd'hui?

Annonce du sujet

Aujoud'hui, nous allons voir l'acido-alcalimétrie

Activité principale

Analyse

Qu’est-ce que l’acidimétrie ?

 

Ou est ce qu’on place l’acide ? base ?

Analyse

acido-alcalimétrie

 Acidimétrie : est le dosage volumétrique d’acide fort par une base forte.

  • Calculs théoriques
    • Acide dans le bécher
    • Base dans la burette
    • On mesure le PH de la solution contenue dans le bécher
    • Initialement : Vb=oml.

Quel est le volume de base au début ?

 

 

Quelle est la formule pour trouver le nombre d’eq. D’acide ?

Nombre d’équivalent acide

N=(Na*Va) / 1000     PH=-logNa

N.eq.g= (Nb*Vb) / 1000    

             -  avant le PE Na*Va>Nb*Vb

NH+={(Na*Va) - [(Nb*Vb) / (Va+Vb)]}

PH=-log{[(Na*Va) -(Nb*Vb)]Va+Vb}

  • Au PE Na*Va=Nb*Vb PH=7
  • Apres le Pe : Na*Va<Nb*Vb

Quelle est la quantité du sel après le PE?

 

Comment est la solution du PE ?

Après le PE, les sels ne se forment plus cad la quantité du sel formée au PE reste le même après le PE.

Au PE, la solution est neutre, les sels ne subissent pas l’hydrolyse.

[H+][OH-]=10-2 D’où PH=7

EX : A 20ml d’une solution de H2SO4 o,4N, on ajoute 30ml d’une solution de KOH.0,3N.

  1. Calculez le PH de la base obtenue.
  2. Quelle est la masse du sel formé?
  3. Quel est le g/l du sel formé?

EX : A 20ml d’une solution de H2SO4 o,4N, on ajoute 30ml d’une solution de KOH.0,3N.

  1. Calculez le PH de la base obtenue
  2. Quelle est la masse du sel formé
  3. Quel est le g/l du sel formé

Synthèse

Comment trouver le PH de la base acide si Vb=oml?

Quel est le PH au PE?

Si Vb=oml le PH=-logNa

Au PE le PH=7

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