The role of water in the chemical weathering of rock is that It aids in changing the chemical composition of rock.
Explanation:
An example is that acidic rain dissolves calcium carbonate minerals in limestone.
CaCO₃(s) + H₂O → CaHCO₃ (aq)
The CaHCO3 is aqueous meaning it dissolves in the water and is washed away with water leaving the rock brittle.
Another example is rocks with iron minerals. These rocks when exposed to water moisture and oxygen turn brittle due to the formation of rust.
2Fe → 2Fe²⁺ + 4e-
O₂ + 2H₂O + 4e- → 4OH⁻
2Fe²⁺ + 4OH⁻ → 2Fe(OH)₂
Fe₂O₃.H₂O (Rust)
Learn More:
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