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Résumé Synthèse sciences UAA 14
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Résumé et explication cours sur les solutions aqueuses UAA14
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Les solutions aqueusesA l'échelle atomique, l'eau est composée de 2 atomes d'hydrogène et 1 atome
d'oxygène.
Schéma
Sa forme n'est pas linéaire mais coudée.
- L'eau bout à 100°
- L'état passe de liquide à gazeux
Une solution est: mélange entre un solvant et un ou plusieurs solutés
Mélange homogène: mélange où on ne distingue pas les composants à l'œil nu
Mélange hétérogène: mélange où on voit les diKérents composants à l'œil nu
Solvant: substance dans lequel un soluté se dissout
Soluté: substance qui peut se dissoudre dans un solvant (sel, sucre)
Solutions aqueuse -> solvant=eau
Solutions non aqueuse -> l'eau n'est pas forcément le solvant
Abaque :
Kl Hl Dal L Dl Cl Ml
Kilolitre Hectolitre Décalitre Litre Décilitre Centilitre Millilitre
Formule concentration massique : C= m/v
Unité : g/l
C= concentration massique
M= masse (g)
V= volume (L)
On cherche une masse à peser: m = C.V
On cherche un volume à mesurer : V = M/C
Ci : concentration initiale unité: g/l
Vi: volume initiale unité : L
Cf: concentration finale unité : g/l
Vf: volume finale unité : L
Concentration finale tjrs inférieur à la concentration initiale.
Volume finale tjrs supérieur à la concentration initiale.
Volume finale: Vi+ V ajouter = V finale
Volume ajouté: V ajouter = Vf x Vi
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