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8

Oscar Lanzi's answer addressed the points correctly. This reaction of Al + NaOH pellets is used in drain openers for obvious reasons. The reaction is so exothermic that solution can start boiling. It generates a lot of heat, efferevesence and steam. The key point is that only chemically pure hydrogen is odorless and colorless, otherwise it is not. The OP ...


7

The consensus is that the odor could come from multiple causes: Droplets of solution: Evolved gas (or even gas being blown over the liquid, as with winds blowing over a lake or ocean) can carry tiny particles of the liquid, which in this case is a caustic solution. In general, any gas-evolving reaction likely involves a toxic or corrosive medium that reacts ...


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