GEOCHEMICAL WEATHERING — Name the reaction with carbonate/bicarbonate The reaction in which carbonate and bicarbonate ions interact with minerals during chemical weathering is called:

Introduction / Context:Chemical weathering alters minerals via reactions with water, acids, oxygen, and dissolved species. Identifying the correct reaction mechanism helps explain karst landscapes, soil pH, and mineral stability.

Given Data / Assumptions:

• Reactive species: carbonate (CO3^2−) and bicarbonate (HCO3^−) ions.
• Setting: near-surface waters containing dissolved carbon dioxide.
• We seek the named process involving these ions.

Concept / Approach:Carbonation refers to reactions of carbonic acid (H2CO3) and its dissociation products (HCO3^−, CO3^2−) with minerals—especially carbonates like calcite—often increasing solubility and forming bicarbonate in solution. It is central to limestone dissolution and cave development.

Step-by-Step Solution:CO2 dissolves in water → forms carbonic acid.Carbonic acid reacts with minerals (e.g., CaCO3) → forms calcium bicarbonate in solution.This process is termed carbonation.

Verification / Alternative check:Karst terrains with sinkholes and caves are classic field evidence of carbonation dominating weathering.

Why Other Options Are Wrong:Hydrolysis — reaction with water splitting ions; common in silicate breakdown but not specifically carbonate/bicarbonate-driven.Oxidation — electron loss (e.g., Fe2+ to Fe3+), unrelated to carbonate ions.Solution — general dissolution without specifying the carbonate chemistry.Chelation — organic ligand complexing metals; different mechanism.

Common Pitfalls:Using “solution” generically; here the named carbonate-driven mechanism is carbonation.

Final Answer:carbonation