formules.py

Created by mathysappy

Created on April 25, 2024

684 Bytes

FORMULES


n = m/M
C=n/M
Cm=m/V

n=(CmxV)/M
C=Cm/M

pH = -log([H3O+]/C°)
C°=1
[H3O+]= C°x10(-pH)

pH = -logC : acide fort
pH = pka (14) + log C : base forte

si ph neutre : [H30+]=[HO-]
pH = -log(Ke puissance 1/2)
pH = 1/2 x pKe

pkA = - log(Ka)
Ka =  10(-pKa)

Ka = ([H30+]eq x [A-]eq)/[AH]eq

Formule brute
C...H...O...

Autoprotolyse de l'eau
2H20 -> H3O+ + HO-
Ke = 10 puissance -14
pkE = 14

pH = pKa + log([A-]eq/[AH]eq)
- [A-]<[AH] => log <0 
pH<pkA
- [A-]=[AH] => log =0 
pH=pkA
- [A-]>[AH] => log >0 
pH>pkA

sol tampon = pH varie peu suite
a un ajout modere d acide fort 
ou de base forte ou suite a une
dilution
ex : sang, salive, sol etalonner
ph-metre...)

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