Write balanced chemical equations (BCE) and equilibrium constant expressions (K)

Question

Write balanced chemical equations (BCE) and equilibrium constant expressions (K) for the three key reactions that describe the effect of ocean acidification on marine exoskeletons: the dissolution of gaseous carbon dioxide in water, the reaction of aqueous carbon dioxide with water to form carbonic acid, and the reaction of hydronium ion (H3O+) with solid calcium carbonate to form calcium and bicarbonate (HCO3-) ions. Note any special features of these reactions and how you deal with them when writing the BCE and K expressions

Explanation / Answer

CO2(g) + H2O(l) = H2CO3(aq)

K =[product]/[reactantds]

= [H2CO3]/ [CO2][ H2O]

The reaction of CO2 (l)with H2O is going to give H2CO3

CO2(l) + H2O(l) = H2CO3(aq)

K =[product]/[reactantds]

= [H2CO3]/ [CO2][ H2O]

(H3O+) + CaCO3   = Ca + bicarbonate (HCO3-) ions + H2O

K =[Ca ][ HCO3-][ H2O]/ (H3O+)][ CaCO3 ]

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