Calcium carbonate solid dissolves only slightly when placed in water. Write a ba

Question

Calcium carbonate solid dissolves only slightly when placed in water. Write a balanced equilibrium molecular equation, and write an equilibrium constant expression (K). Aqueous carbonate ion reacts with hydronium cations to form carbonic acid (H_2 CO_3). Write a balanced equilibrium molecular equation, and write an equilibrium constant expression (K). Aqueous carbonic acid is unstable and decomposes to carbon dioxide gas and liquid water. Write a balanced equilibrium molecular equation, and write an equilibrium constant expression (K). By the way, these three equilibrium equations are very Important in limestone cave formation processes. The second two equilibrium equations are important parts of the carbonate blood buffer system

Explanation / Answer

CaCO3 (s) + H2O(l)-------> Ca(OH)2(s) + CO2(g)

     K   = [CO2]

CO32-(aq) + 2H3O+(aq) -------> H2CO3(aq) + 2H2O(l)

K   = [H2CO3]/[H3O+]CO32-]

H2CO3(aq) ---------> H2O(l) + Co2(g)

   K   = [CO2]/[H2CO3]

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