Question about problem 6D.15(b)

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Sam Joslyn 1G
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Joined: Fri Sep 28, 2018 12:20 am

Question about problem 6D.15(b)

Postby Sam Joslyn 1G » Wed Jan 23, 2019 9:25 pm

Question 6D.15(b) in the 7th Edition of Chemical Principles asks to find the pH of a system with 0.055 M AlCl3. I am confused as to how to proceed with this problem, because I do not know how this molecule can create hydronium or oxide ions. Did anyone figure this one out?

Samantha Man 1L
Posts: 63
Joined: Fri Sep 28, 2018 12:22 am

Re: Question about problem 6D.15(b)

Postby Samantha Man 1L » Wed Jan 23, 2019 9:40 pm

Al3+ cations become hydrated by water molecules that act as Bronsted acids when they are placed in water so Al3+ will become Al(H2O)6 as seen in Table 12.8. Metal cations usually have 6H2O molecules attached to it. That will be used as your acid and you can set up the equation such that Al(H2O)6+H2O--> H3O+ Al(H2O)5OH.

Lia Inadomi 1I
Posts: 62
Joined: Fri Sep 28, 2018 12:15 am

Re: Question about problem 6D.15(b)

Postby Lia Inadomi 1I » Wed Jan 23, 2019 11:00 pm

Why does H2O attach to the aluminum when H2O is uncharged?


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