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EfficientEagle2708

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

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Louis-Philippe B

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:

$$ pH = -log[H^+] $$

This webpage from the Alloprof website explains the acidity constant:

https://www.alloprof.qc.ca/en/students/vl/chemistry/the-acidity-constant-ka-c1045?token=19c02e41-9f75-4a2e-acae-1fe249d6f973

Don't hesitate if you need more help!