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Eggshells contain the calcium carbonate, which is a base. It is the same substance found in limestone.

The carbonate (CO32-) ion reacts with acids to form the bicarbonate ion (HCO3-), or carbonic acid (H2CO3), a very weak acid that easily breaks down.

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Are egg shells acidic?

Yes, eggshells are composed mainly of calcium carbonate, which is a basic compound. However, when eggshells are broken down or decomposed, they release carbon dioxide, which can create a weak acid called carbonic acid. So, while eggshells themselves are not acidic, they can form acidic compounds during decomposition.


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