Alum from Soda Cans

Alum from Soda Cans

Video Analysis for Alum from Soda Cans

May 15, 2014

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Alum from Soda Cans

In today’s video I make alum from an aluminum can!

This is a cool reaction that I’ve wanted to try for a while, because I generate a lot of soda can waste and have always wanted to recycle them in some way (besides everyday recycling, that is).

The reactions involved in this experiment are:

1) Dissolving the can in base - 2Al + 6H2O + KOH == 2KAl(OH)4 (aq) + 3H2

2) Initial addition of acid to this solution - 2KAl(OH)4 + H2SO4 == 2Al(OH)3 (s) + 2H2O + K2SO4

3) After adding more acid - 2Al(OH)3 + 3H2SO4 == 2Al(3+) + 3SO4(2-) + 6H2O

This last step, when combined with the K(+) ions still in solution, forms the double salt potassium alum ( KAl(SO4)2 * 12H2O ) upon cooling and evaporation.

My can was 13.5g, meaning I needed to use 28g KOH and 52.5mL 98% H2SO4.



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