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TD1 de biophyyy


Go to solution Solved by EniramJ,

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Posted

Salut, 

(Je vais essayer même si le pH n'est pas mon domaine de prédilection X) )

On a 0,1 L d'acide de concentration 0,01 mol/L, donc on a 10-3 mol d'acide.

On ajoute 0,05 L de base forte de concentration 0,01 mol/L donc on a 5*10-4 mol de base.

On a donc 5*10-4 mol d'acide qui vont se combiner à la base, donc on aura plus que : 10-3 - 5*10-4 = 5*10-4.

Donc au final, on aura la même quantité d'acide que de base dans cette solution !

Donc au niveau de la formule, on a : pH = pKa + log [5*10-4*0,150]/[5*10-4*0,150] = pKa + log 1 = pKa = 4.

Et du coup l'item est juste 🙂 

 

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