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DOSAGE Flashcards

(15 cards)

1
Q

C’est quelle réaction
H2O + H2O —-> H3O+ + HO-

A

AUTOPROTOLYSE DE L’EAU

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2
Q

Ke est indépendant de la nature des espèces dissoutes dans la solution
vrai ou faux ?

A

vrai

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3
Q

Ke ne dépend pas de la température
vrai ou faux ?

A

faux

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4
Q

c’est quoi Ka ?

A

la constante d’acidé

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5
Q

quelle est la relation entre PKa et pH ?

A

pH = pKa + log([ B]/[ A])

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6
Q

c’est quoi K ?

A

La constante d’équilibre

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7
Q

pour une même concentration apportée d’acide , in acide A1 est plus fort qu’un acide A2 si le taux d’avancement final de sa réaction avec l’eau est ……

A

plus grand

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8
Q

si pH = pKa
alors

A

log([ B]/[ A])= 0

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9
Q

si pH > pKa
alors

A

log([B]/[ A]) >0 et [A]<[B]
la base B prédomine

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10
Q

comment appelle-t-on ce diagramme ?

A

diagramme de distribution

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11
Q

quel est le but de dosage ?

A

déterminer la concentration molaire d’un espèce chimique

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12
Q

c’est quoi ?

A

le protocol expérimantal de dosage

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13
Q

combien on a de méthodes pour déterminer le point d’équivalence ?

A

deux méthodes

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14
Q

quelle est la première méthode ?

A

méthode des tangentes parallèles

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15
Q

la deuxième méthode ?

A

la courbe de la dérivée première de pH en fonction de Vb

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