## 6d.11f

Acidity $K_{a}$
Basicity $K_{b}$
The Conjugate Seesaw $K_{a}\times K_{b}=K_{w}$

Doris Cho 1D
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### 6d.11f

Decide whether an aqueous solution of each of the follow- ing salts has a pH equal to, greater than, or less than 7.
e) AlCl3?
can someone explain why this is acidic and the chemical equation.

Chem_Mod
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### Re: 6d.11f

In class we discussed small metal cations not in group 1 and 2 (mainly transition metal cations) will act as acids in water. First they form coordinate covalent compounds with water molecules; these water molecules will then lose a proton to free floating water molecules, thus generating hydronium ions, making solution acidic. Water attached to Al3+ that lost proton becomes OH-, so Al3+ Becomes Al2+