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Acide butanoïque : R – CO 2 H

Acide butanoïque : R – CO 2 H. Pour avoir la formule de la base conjuguée, il suffit de retirer un H + à la formule de l’acide, on obtient : R – CO 2 -. pH = 3,7 donc [H 3 O + ] = 10 -3,7 = 2,0.10 -4 mol.L -1.

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Acide butanoïque : R – CO 2 H

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  1. Acide butanoïque : R – CO2H Pour avoir la formule de la base conjuguée, il suffit de retirer un H+ à la formule de l’acide, on obtient : R – CO2-

  2. pH = 3,7 donc [H3O+] = 10-3,7 = 2,0.10-4mol.L-1. La concentration en ions oxonium est inférieure à la concentration initiale de l’acide, donc l’acide n’a pas totalement réagit pour former des ions oxonium : c’est un acide faible. R – CO2H(aq)+ H2O(l)R – CO2-(aq)+ H3O+(aq)

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