The equilibria between calcium carbonate, CaCO3, water, and carbon dioxide is co

Question

The equilibria between calcium carbonate, CaCO3, water, and carbon dioxide is complex and has been studied extensively due to climate change and the impact of climate change on the world’s oceans. The equilibria can be considered as two different cases:

(1) CaCO3 in equilibrium with water only (i.e., closed to the atmosphere), and

(2) CaCO3 in equilibrium with water that is open to the atmosphere (which contains CO2).

For each of these 2 cases, perform the first 5 steps of the systematic method. Verify that you have the appropriate number of equations for the number of unknowns.

Explanation / Answer

1) In a closed system

Ca 2+ = (H2CO3 ) + (HCO3)- + (CO3)2-

The only charged species in the solution can be calcium ions , H+, HCo3-, CO3-

CaCO3 --> Ca2+ + Co32-

CO32- + HOH ----> HCO3- +OH-

Open system:-

In open system Carbon die oxide and water mixes to form calcium carbonate there is formation of H2Co3 which then releases a molecule of carbon die oxide which turns lime water milky

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