The Help Zone is under renovation.

See if your question has already been asked!

Chemistry
Post-secondary • May 18, 2025
How do I do this I am getting stuck because I’m not understanding how the Al3+ ion is not just taking one H and leaving the rest as OH like every other problem I have done
IMG_0767.jpeg

Answer (1)

Alloprof Answer
May 19, 2025
Thanks for your question!

Indeed, sometimes ions can dissociate into more than simple H+ ions! I recommend that you take the time to spell out the full chemical equation. That should help you write down the acidity constant and infer what the pH is. Remember:
pH=log[H+] pH = -log[H^+]

This webpage from the Alloprof website explains the acidity constant:
Alloprof aide aux devoirs | AlloprofGrâce à ses services d’accompagnement gratuits et stimulants, Alloprof engage les élèves et leurs parents dans la réussite éducative.
Don't hesitate if you need more help!