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Because the acetic acid in the vinegar reacts with the solid calcium carbonate crystals that make up the eggshell, separating them into their calcium and carbonate parts, the calcium ions floats free and the carbonate makes the bubbles (carbon dioxide) that you can see on the egg. The protein that binds the calcium and carbonate is the froth that you can see on the top.

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12y ago
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10y ago

The vinegar is an acid, which eats the egg shell off.

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Q: Why does the vinegar eat the eggshell?
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