Acid Base Reactions
Acid-base reaction (hydrolysis)
Consider an aqua-complex such as M(H2O)62+.
Now think about one of the M - OH2 coordinate bonds. Electron density will be pulled along the coordinate bond towards the metal ion.
Fortunately for the M2+ion this is a fairly small effect.
Supposing we think about this for a M3+ ion. The positive charge is larger and so the electron density s more attracted to the transition metal ion. If it is pulled strongly enough, it could break the O-H bond. This would release a H+ ion. This is especially likely to happen if there is a base handy to grab hold of the H+ions.
Consequently, M3+ ions are considered to be acidic.
Video about Arrhenius, Bronsted Lowry, and Lewis Acids and Bases.
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