Question

Rank the following hydroxides in order of increasing aqueous basicity: Al(OH)3, B(OH)3, In(OH)3.

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As we've already seen in previous exercises, electronegativity\textbf{electronegativity} decreases down the group meaning that elements are less capable of attracting a shared electron pair. Due to the fact acids are, by definition, proton-donors\textbf{proton-donors} and electron-acceptors\textbf{electron-acceptors} we can conclude that lower electronegativity means higher basicity. Therefore:

B(OH)3<Al(OH)3<In(OH)3\boxed{\text{B}\left(\text{OH}\right)_3 < \text{Al}\left(\text{OH}\right)_3 < \text{In}\left(\text{OH}\right)_3 }

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