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Seashells contain calcium carbonate. The calcium carbonate reacts with the acid in the vinegar and causes carbon dioxide bubbles to form. Even though the acid in vinegar is weak it can, over a period of time, dissolve shells.
Reply. So when Iâm trying to get calcium out of eggshells for my garden I break down the egg shells (which are calcium carbonate I believe) in 2 to 1 water to vinegar which separates it into calcium and hydrogen. My question is, is the calcium what is left over in the egg shell or is it in the water.eply. the liquid left behind from dissolving eggshells in vinegar is where the calcium is. The acid in the vinegar breaks the calcium carbonate (what eggshells are) into pure calcium and carbonate (CO3 gas) which is what causes the mixture of eggshells and vinegar to bubble.