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i don't understand how to solve it.

I really wanted more help than that. I know you can't solve it; if you could, you wouldn't have asked for help. I wanted to know WHAT about the problem you don't understand. Here are some hints to get you started.
[Al(H2O)6]3+ + H20 ==> [Al(H2O)5(OH)]2+ + H3O+

Write the Ka expression. If you let x = H3O^+, then the other product = x also, and the problem tells you that the starting material is 0.1 M. Plug in those values, solve for x and convert that to pH.
Post your work if you get stuck.

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  1. pH IS 2.96

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