This happens when the minerals of which the rock is composed are changed, keading to the disintergration of the rock.
Granite is one type of rock that is vulnerable to chemical weathering. Feldspar, one of the minerals that make up granite, is converted into clay minerals such as kaolin (china clay).
The distinctive landforms both above and below the ground areas of Carboniferous limestone owe their origins to limestone solution.
This type of chemical weathering is also called carbonation because the dissolivng of the limestone changes calcium carbonate into bicarbonate.
THE CHEMICAL FORMULA FOR LIMESTONE SOLUTION-
CaCo3 + H2O + CO2 --> Ca(HCO3)2
Calcum carbonate + Water add Carbon dioxide (carbonic acid) --> Calcium bicarbonate
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