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15 - Chemistry 1000 Lecture 15 The group 13 metals Marc R...

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Chemistry 1000 Lecture 15: The group 13 metals Marc R. Roussel
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The group 13 metals I All the elements in group 13 except boron are metals. I Common ions: Al 3+ , Ga 3+ , In + , Tl + , also sometimes In 3+ and Tl 3+ I Under typical reactions, these metals don’t react with water. I At room temperature, the oxide formed is M 2 O 3 . I Al(OH) 3 , Ga(OH) 3 and In(OH) 3 are all insoluble in water, but TlOH is very soluble.
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Passivation of aluminium I Aluminium is extremely reactive. I Aluminium fires, when they occur, burn extremely hot. I Have you ever seen aluminium burn? Probably not. I Reason: Aluminium oxide forms extremely fast on surfaces exposed to air. I Aluminium oxide I is hard I has a high melting point I is non-porous Passivation: formation of a protective oxide layer
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Anodization of aluminium I Deliberate, electrolytic thickening of the oxide layer: 2Al (s) + 3H 2 O (l) Al 2 O 3(s) + 6H + (aq) + 6e - I Has the following effects: I Makes Al more chemically resistant I Makes Al harder I May be used to pigment the oxide layer with appropriate additives
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