Acide Et Bases Flashcards

1
Q

Acide

A

Cède un H+

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2
Q

Base

A

Capte un H+

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3
Q

XH + H2O
Donne?

A

X- +H3O+

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4
Q

Quelle est la forme acide de HS-

A

H2S

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5
Q

Formule de la constante d’acidité

A

Ka = [H3O+] . [A-] / [AH]

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6
Q

Formule du pKa

A

pKa = -log Ka

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7
Q

Acide fort=

A

Acide qui se dissocie complètement

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8
Q

Quand néglige on [H+]eau

A

Si [H+]acide > 10E-5 mol/L

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9
Q

pH de l’acide fort en concentré

A

pH= -log C

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10
Q

pH de l’acide fort en dilué

A

pH= -Log ([H+]acide + [H+]eau)

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11
Q

Acide faible en concentré

A

pH= 1/2 (pKa - log C)

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12
Q

Acide faible en solution diluée

A

Alpha et dissociation de l’eau ne peuvent plus être négligées

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13
Q

pH Base forte en concentré

A

pH= 14+ log C

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14
Q

Constante de basicité

A

Kb = [BH].[OH-] / [B-]

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15
Q

Ka.Kb=

A

[H+].[OH-]= ke

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16
Q

Kb=

A

[OH-]^2 /[C]

17
Q

pH Base faible en concentré

A

pH= 7+ 1/2pKa + 1/2logC

18
Q

pH base faible en dilué

A

Beta et la dissociation de l’eau ne peuvent plus être négligés

19
Q

Solution diluée

A

[C]<10^-5mol

20
Q

Solution concentrée

A

10^-5<[C]<10^-2