Why Does Vinegar Affect Limestone?
One of the most common, simple and fun science experiments involves limestone and vinegar. When limestone is introduced to vinegar, a chemical reaction occurs. Bubbles will begin rising off the limestone and a little heat will be produced. The vinegar and limestone yield several different compounds after the reaction occurs. There are several reasons why these events happen.
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Reaction
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Vinegar is diluted acetic acid, and limestone is calcium carbonate. Acetic acid is as it's named, an acid. Calcium carbonate is a base, and is commonly used as an antacid for indigestion. Heat is always produced between an acid and a base. Acids and bases create salts and water when mixed together.
Products
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The fizzing bubbles are carbon dioxide rising to the surface. These rising bubbles are the same as bubbles in soda pop and are called "effervescence." The vinegar becomes water, and a calcium salt named calcium acetate is created. Calcium acetate is commonly used as a food additive and buffer.
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Bonds
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Bonds are what hold together chemical compounds. When these bonds are destroyed, a reaction occurs. When bonds are broken, energy is released which creates heat. Vinegar reacting with limestone breaks the bonds of calcium carbonate and acetic acid. New bonds are created out of the broken compounds, which are the products of the reaction.
Chemical Equation
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CaCO3 + 2CH3COOH = Ca(CH3COO)2 + H2O + CO2. Limestone (CaCO3) combined with vinegar (2CH3COOH ) yields calcium acetate Ca(CH3COO)2, water (H20) and carbon dioxide (CO2). This equation shows how each compound is broken and bonded, and the products of the reaction.
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References
- Photo Credit soda-water drinks image by Maria Brzostowska from Fotolia.com
