CaCO3 + 2CH3COOH = Ca (CH3COO)2 + CO2 + H2O
i.e. produces water, carbon dioxide and calcium acetate
The reaction between Chalk and Vinegar creates carbon dioxide. Chalk is calcium carbonate and when vinegar is poured on it. It is prepared from water and acetic acid it should fizz up as the oxygen in the acetic acid combines with the calcium carbonate. The foams are carbon dioxide that is formed when the oxygen from the acetic acid links with the carbon from the calcium carbonate.
It isn't so much soluble in vinegar as much as it reacts with the acetic acid. Vinegar is a mixture of 5% acetic acid in water. The calcium carbonate, which is insoluble in water, reacts with the acetic acid to produce water, carbon dioxide, and calcium acetate. The calcium acetate is water soluble.
It dissolves the shell. Vinegar is dilute acetic acid, and the shell is mostly calcium carbonate. Vinegar has, among other things, a chemical called Acetic Acid (about 3% of it is acetic acid). Egg shells contain calcium carbonate. Calcium carbonate in the egg shell reacts with vinegar to form carbon dioxide (can be seen as bubbles in the vinegar). The reaction is: CaCO3+ 2H+ -> Ca+2 + H2O +CO2
Acetic acid, also known as ethanoic acid, is a mild acid. However, it still displays acidic properties, one of them being... metal carbonate + acid ---> salt + water + carbon dioxide So when calcium carbonate is added to ethanoic acid, the following reaction occurs. CaCO3+2CH3COO-H+ ---> (CH3COO-)2Ca2++H2O+CO2
Eggshells are calcium carbonate. The acetic acid in vinegar attacks the carbonate, releasing carbon dioxide gas and leaving calcium acetate, which is soluble. Other examples of this include calcium deposits from hard water, pearls, and bones. The calcium carbonate in the eggshell has a pH of around 9, which chemically makes it a base. The acetic acid in the vinegar has a pH of around 2.4, which makes it an acid. When the two come in contact, a chemical reaction happens, and the changes happen as listed earlier.
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