What are the bubbles produced by putting aluminum in lemon juice?

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paul.fr

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I have this cup full of lemon juice, and everytime i put a strip of aluminium in to it, bubbles form! What are these bubbles and why are they being produced?

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Offline lightarrow

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I have this cup full of lemon juice, and everytime i put a strip of aluminium in to it, bubbles form! What are these bubbles and why are they being produced?
2Al + 2H3Citr → 2AlCitr + 3H2

where H3Citr means citric acid and AlCitr means aluminum citrate. The hydrogen gas H2 is responsible of the bubbles.

Anyway AlCitr idrolizes in water forming Al2(OH)3 and H3Citr again.