h2o pka


  • Quel est le pKa de l'eau ?

    pKA, = 15,75 (couple H,O/OH-).
  • Quelle est la valeur du pKa ?

    Le pKa d'un couple acide base est défini par la relation suivante : pKa = - Log (Ka). Le pKa va permettre de déterminer la force d'un acide.
  • Quel est le pH de h2o ?

    pH de l'eau pure. Le pH de l'eau pure à 25°C est 7,0.
  • On utilise généralement le Pka plutôt que le Ka pour déterminer la force d'un acide. On remarque que plus l'acide est fort plus le pKa est petit. En effet, si celui est fortement dissocié, la concentration [AH] devient faible.
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