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Caustic soda (sodium hydroxide) is available at bunnings in the cleaning section. However you should be very careful as it can etch the pyrex if its too strong. This is why its never placed in a burettes in analytical labs. As aluminium is amphoteric you would do just as well using a dilute solution (2.0 mol/L) of hydrochloric acid which will not affect the glass and will remove the Al quicker without heat.
Mark
Last edited by marki; 21-04-2009 at 07:43 PM.
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