formule PH

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15 Terms

1
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Constante d’équilibre Ke

Ke=(H3O+).(OH-)

2
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PKe

pKe= -log Ke

= -log (H3O+)-log(OH)

3
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pH


pH= -log (H30+)

PH= pka+ log (base/acide)


4
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5
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Constante d’acidité Ka

Ka= (A-).(H3O+)/(AH)

6
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pKa


pKa= -log Ka


7
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pKa


pKa= -log Ka


8
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Activité

a=YxC

C:concentration en mol.L

Y: coefficient d’activité

9
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PH acide fort

PH= -log C

10
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PH base forte

PH= 14+log C

11
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PH acide faible

PH= 1/2pka - 1/2log C

12
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Ph base faible

PH= 7+1/2pka+ 1/2logc’

C’= concentration de la base faible considéreé comme constante

13
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PH solution tampon

PH=pka+log base/acide

PH= pka+log c’/c

PH=pka+logn(A-)/n(AH)

14
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PH acide faible et base faible de deux couples différents de meme concentration

PH= pka1+pka2/ 2

15
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PH solution amphiolyte

PH=PKa1=Pka2/2