CARBONATE EQUILIBRIA - UC Davis

Soil Chemistry5-1 Section 5- CARBONATE Chemistry CARBONATE EQUILIBRIAC arbonates are arguably the most important dissolved component of soil solutions and in alkaline soilsthis statement is even less disputable. Implicit in this statement is the relationship among dissolved carbonatespecies whether or not they are in equilibrium with solid phase metal carbonates . The simplest example ofcarbonates is the control which dissolved carbon dioxide has on water pH and buffering. In this section of thecourse we will consider the effect of carbon dioxide on water pH, the influence of solid phase calcium carbonateon solution composition and the implications of these systems including carbon dioxide, solution and solid phase carbonates can be envisioned. Someof these include (after Garrels and Christ, 1967).1. The solution pH of water in equilibrium with carbon dioxide and essentially devoid of othercontrolling species.

Soil Chemistry 5-3 Section 5- Carbonate Chemistry -3 + 2- 3 o - 10.3 - HCO 3 ( )H CO ( ) = K = 10 ( HCO ) (4) As for every aqueous reaction the acid base relationship between the …

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  Carbonates, Aqueous, Equilibria, Carbonate equilibria

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