Calcium Carbonate + Hydrochloric Acid -> Calcium Chloride + Carbon Dioxide + Water 

CaCO3 + 2 HCl -> CaCl2 + CO2 + H2O 

Type of Reaction
Acid – Carbonate
A reaction where a salt is formed with carbon dioxide and water, and the products are an acid and a carbonate.

Mainly used as a preservative, a drying agent or  to prevent to formation of dust and snow. It is used to deice on road surfaces and planes. Also in pools to decrease the erosion of the concrete, in marine aquariums for shelled animals. Then in the European Union it is a permitted food additive. For foods its used in the brewing of beer and as an additive in canned food and tofu.

Obtained Reactants
CaCO3, Limestone is prepared from mining or quarrying. If marble is quarried you would get pure calcium carbonate.

HCL, Hydrochloric Acid is prepared by dissolving hydrogen chloride in water, and this process is usually incorpareted in large scale production with other chemicals.

Conditions for Reaction to Occur
There doesn’t have to be a certain temperature in the room, but to get pure calcium chloride you need to use a hot plate to evaporate the water. In addition when the reactants are combined there will be a fizz.

Properties of Hydrochloric Acid
HCl has the appearence of a transparent or light yellowish liquid. Hydrochloric acid is considered a monoprotic acid because it can dissociate or ionize. Hydrochloric acid can also join water to  form another ion, hydromium, H3O. Hydrochloric acid weights 36.46 g/mol and has the denisty of 1.18 g/cm3, which melts at -27.32 degrees Celsius and boils at 48 degrees Celsius in a 38% solution.

Hydrochloric Acid

Properties of Calcium Carbonate
Snow white fine powder is what CaCO3 looks like. It is an acid with a PKa of 9, and shares many chemical properties with other carbonates. With other strong acids it reacts to make carbon dioxide. When reacted with saturated water (from carbon dioxide) calcium carbonate will produce a soluble calcuim bicarbonate. That reaction is what causes erosion which leads to the forming of caverns. The mass of calcuim carbonate is 100.0869 g/mol, it has a denisty 2.71 g/cm3 (calcite), then at 865 degrees Celsius (calcite) it melts and does not boil, it decomposes.

Calcium Carbonate

Properties of Calcium Chloride – (Anhydrous)
Calcium Chloride is a white lumpy solid that can easily be crumbled up. CaCl2 is an acid with a Pka of 8-9 and is a soluble where as most other calcium compounds are not. It is a source of calcium ions when it is in a solution. The molar mass is 110.98 g/mol with a density of 2.15 g/cm3, melting pointing at 772 degrees Celsius then the boiling point at 1935 degrees Celsius.

Calcium Chloride

Significance of Reaction
Calcium chloride is very important in road safety to de-ice the roads, it is a needed ingredient in food as a preservative. Using hydrochloric acid is also eco-friendly.



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