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  1. Edit: Crab shells are made out of chitin, NOT calcium carbonate.

    Crab shells are made out of calcium carbonate (CaCO3) which reacts easily with HCl. The bubbles are CO2 gas which is a product of the reaction.

  2. HCl is a very strong acid that is actually found in our stomach acid cocktail. If you put your own hand in something with a high enough molarity of that (very concentrated), you would react the same way; your body would just be eaten away by it for the same reasons. HCl corrodes most organic materials.

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