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Dosage gravimétrique

6ème Biologie Chimie - Chimie

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Dosage gravimétrique

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 la gravimétrie, énumérer les principes de la gravimétrie et donner les étapes de la gravimétrie.
Réference	Notion de la chimie 6 et Maîtrise chimique 4
Activité initiale
Rappel En quoi consiste l’analyse chimique quantitative ?		Rappel L'analyse chimique quantitative consiste à connaitre la quantité de chaque constituant de la matière .
Motivation Quels sont les types de dosage de la méthode chimique ?		Motivation Les types de dosage de la méthode chimique sont la gravimétrie et la volumétrie
Annonce du sujet Qu'allons-nous étudier aujourd'hui?		Annonce du sujet Aujourd'hui, nous allons voir le dosage gravimétrique.
Activité principale
Analyse Qu'est-ce que la gravimétrie?		Analyse La gravimétrie Définition Est une méthode qui consiste à peser la quantité d’une substance peu soluble séparée par précipitation, on mesure le volume d’une substance volatile obtenue par volatilisation.
Quel est le principe de cette méthode ?		Principe La Méthode consiste à transformer par diverses relations une espèce soluble (dans un milieu) de constitution chimique bien définie que l’on sèche, que l’on calcine et on pèse.
Quelles sont les étapes de cette méthode ?		Etapes La méthode se fait à 5 étapes : Peser l’échantillon à l’aide de la balance; Dissoudre l’échantillon dans le solvant; Précipiter l’ion, l’élément ou le composé à doser avec une relation des différents précipitants appropriés pour obtenir un précipité contenant l’ion ou l’élément de la substance à doser Filtrer, lavé, sécher et calciner le précipité sec. Peser le précipité sec. La masse est symbolisée par P.
Quelles sont les qualités d’un précipité à obtenir ?		Qualité du précipité à obtenir Etre très peu soluble dans le milieu relationnel; Ne pas être susceptible d’observer d’autres ions, ni une quantité inconnue de solvant; Devoir bien cristalliser pour faciliter la filtration; Avoir une composition chimique bien connue.
Synthèse
Combien des étapes y-a-t-il pour la gravimétrie ?		Les étapes de la gravimétrie sont: Dissoudre; Précipité; Filtrer; Peser

Messages Timeline Exceptions Views7 Route Queries14 Models21 Gate Session Request

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