Chemical weathering is the break-down of rocks or minerals by chemical processes operating at the atomic and molecular levels. New substances frequently form during chemical weathering. Solution, silicate hydrolysis and oxidation are some examples of chemical weathering.
is the process through which minerals and rocks dissolve in water. Carbonic acid formation:
H2CO3 + CO2 = H2CO3
and subsequent solution (or dissolution) of calcium carbonate:
CaCO3 + H2CO3 = Ca2+ + 2HCO3
2. Silicate hydrolysis
primary silicate + H2O + CO2 = clay + cations + HCO3 + SiO2