How is carbonic acid formed in nature? What products result when carbonic acid reacts with potassium feldspar?
What will be an ideal response?
Carbonic acid is formed in nature by falling rain dissolving carbon dioxide out of the atmosphere. Groundwater also dissolves carbon dioxide from decaying organic matter. The weathering of potassium feldspar involves a chemical reaction in which the hydrogen ions (H+) in the carbonic acid replace the potassium ions (K+) in the feldspar structure. Once removed, the potassium is available as a nutrient for plants or becomes the soluble salt potassium bicarbonate, which may be incorporated into other minerals or carried to the ocean by groundwater and streams. The remaining elements in feldspar reorganize to form clay minerals. Additionally, the chemical reaction removes some silica from the feldspar structure via dissolution, which is eventually precipitated out as chert.
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