why FeCl3, AlCl3 makes acidic solution with H20? ??? -.-
why FeCl3, AlCl3 makes acidic solution with H20?
- Thread starter A6project
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Im assuming the form HCl, I did this last night, HCl is a strong acid... I am "assuming" though because that was all I could think of so if anyone could clarify that would be fantastic👍
The reactions are these
AlCl3(s) --> Al3+(aq) + Cl-(aq)
But Al3+ in h2o is really Al(h20)6^3+(aq)
so you get: Al(h2o)6^3+(aq) which dissociates into Al(h2o)5OH^2+(aq) + H+(aq)
Al(h2o)6^3+(aq) --> Al(h2o)5OH^2+(aq) + H+(aq)
AlCl3(s) --> Al3+(aq) + Cl-(aq)
But Al3+ in h2o is really Al(h20)6^3+(aq)
so you get: Al(h2o)6^3+(aq) which dissociates into Al(h2o)5OH^2+(aq) + H+(aq)
Al(h2o)6^3+(aq) --> Al(h2o)5OH^2+(aq) + H+(aq)
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Aluminum is analogous to boron. You make 3 bonds and have an empty p orbital. That empty p orbital allows aluminum compounds to act as lewis acids. The 3 chlorines bound increase the electron deficiency of the aluminum, increasing the reactivity of the empty p orbital. Water acts as a nucleophile, eliminating chlorides as it goes (and essentially forming HCl).
