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calcul de ph en rajoutant des trucs


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  • Ancien Responsable Matière

Hello !

 

Je ne comprends pas même avec la correction comment résoudre les items C et D de ce qcm : (CCB, Purpan, 2017)

Révélation

1556823011-qqqqcm2.png

correction :

Révélation

1556822964-correction-qcm-2.png

 

quelqu'un peut-il m'aider svp ?

 

 

edit = il manque plus que le 2e item ^^

Edited by Soleneuh
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  • Ancien Responsable Matière

Salut ! 

J'ai la réponse de la première ☺️

 

 

 

1556824327-capture-d-ecran-2019-05-02-a-

 

Sorry pour l'écriture ! 

Edited by Claro
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