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Acido-alcalimétrie

6ème Biologie Chimie - Chimie

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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=(NaVa) /* 1000 PH=-logNa N.eq.g= (NbVb) /* 1000 - avant le PE NaVa>NbVb NH⁺={(NaVa) - [(NbVb) / (Va+Vb)]} PH=-log{[(NaVa) -(NbVb)]Va+Vb} Au PE NaVa=NbVb PH=7 Apres le Pe : NaVa<NbVb
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. Calculez le PH de la base obtenue. Quelle est la masse du sel formé? 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. Calculez le PH de la base obtenue Quelle est la masse du sel formé 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

Messages Timeline Exceptions Views7 Route Queries14 Models22 Gate Session Request

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