CO 2 equilibria air – ocean – CaCO 3 CO 2 (g) CO 2 (aq) dissolution CO 2 (aq) + H 2 O H 2 CO 3 (aq) hydrolysis H 2 CO 3 (aq) H + + HCO 3 - (aq) 1st protolysis HCO 3 - (aq) H + + CO 3 2- (aq) 2nd protolysis Ca 2+ (aq) + CO 3 2- (aq) CaCO 3 (s) precipitation CO 2 (g) + H 2 O + Ca 2+ (aq) CaCO 3 (s) + 2 H + net reaction Note that increase in CO 2 (g) will force the reaction to the right.
{"Image DocumentName": "CO2 equilibria air \u2013 ocean \u2013 CaCO3", "Image ImageDescription": "CO2 (g) \u2194 CO2 (aq) dissolution. CO2 (aq) + H2O \u2194 H2CO3 (aq) hydrolysis. H2CO3 (aq) \u2194 H+ + HCO3- (aq) 1st protolysis. HCO3- (aq) \u2194 H+ + CO32- (aq) 2nd protolysis. Ca2+ (aq) + CO32- (aq) \u2194 CaCO3 (s) precipitation. CO2 (g) + H2O + Ca2+ (aq) \u2194 CaCO3 (s) + 2 H+ net reaction. Note that increase in CO2 (g) will force the reaction to the right. Equilibria are governed by the Law of Mass Action + Henry\u2019s Law: The partial pressure of CO2 (g) in air is proportional to the concentration of CO2 (aq) dissolved in water. The proportionality constant is Henry\u2019s Law Constant, KH; strongly dependent on temperature, less on pressure and salinity.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}