The calcium carbonate- calcium bicarbonate equilibrium is particularly important

Question

The calcium carbonate- calcium bicarbonate equilibrium is particularly important for the field of aquatic and environmental chemistry. CaCO3(s) + CO2 + H2O(l) = Ca(HCO3)2 (aq) a)- Demonstrate the equilibrium constant equation for the reaction given below. b)- An experiment in the laboratory determined that a reaction that a reaction mixture containing 11.935 g of CaCO3, 3.86x10^-2 mol/L of CO2, 250 L of H2O and 1.82x10^-7 mol/L of Ca(HCO3)2 had reached equilibrium . Using this information, calculate the equilibrium constant for the calcium carbonate- calcium bicarbonate equilibrium.

Explanation / Answer

K=[Ca(HCO3)2]/[CO2] (since for liquid and solids the concentration is taken to be 1) so Keq=3.86*10^-2/1.82*10^-7 =2.12*10^5

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