What is an example of chemical weathering?  

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gsenviro eNotes educator| Certified Educator

Chemical weathering is the breakdown of rocks by chemical reactions. Chemical weathering involves changes in the chemical composition of the existing rock to form new rock. Some examples of chemical weathering are hydrolysis, oxidation, carbonation, dissolution, etc.

Limestone dissolves by action of acidic water and causes weathering of statues, grave stones, etc. Dissolution of limestone also forms pathways for acidic water, which may result in sink holes. Another example of chemical weathering is rusting of iron objects. In this oxidation process, ferrous ion gets converted to ferric ion (ferric oxide). Hydrolysis of feldspar converts it to clay, such as potassium feldspar converting over to kaolinite and quartz. 

The amount of chemical weathering is a function of available surface area, temperature, climate, chemical composition of the rock, etc. 

Hope this helps. 

 

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