How can you show the process of tooth decay by marbles and dilute hydrochloric acid?
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Bicarbonate is formed which again clears the solution.
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The process of tooth decay can be shown by marbles and dilute hydrochloric acid by chemical reaction. Here marble acts as a tooth and hydrochloric acid is found in our stomach.
- Marble is chemically calcium carbonate and our teeth are also made up of calcium. Now if you add dilute HCl to calcium carbonate, then calcium chloride, water and carbon dioxide is formed.
CaCO3 + 2HCl → CaCl2 + H2O + CO2
- Now, CO2 gas turns lime water milky because of the formation of CaCO3. Here's the chemical equation showing the reaction between lime water and CO2.
Ca(OH)2 + CO2 → CaCO3 + H2O
- When excess CO2 is passed, milkiness disappears because Ca(HCO3)2 is formed that is soluble in water.
CaCO3 + H2O + CO2 → Ca(HCO3)2
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