GEOL 104 Lecture Notes - Lecture 13: Eluvium, Horizon Organic, Soil Chemistry

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Chemical weathering: types of chemical weathering. Halite is one of the most water-soluble minerals a small amount of acid in water increases the corrosive force of water, causing dissolution. Limiting rate on the reaction due to saturation: once it is saturated, can no longer dissolve the mineral. Carbonic acid is created when co2 dissolves in raindrops. Calcite is easily attacked by weakly acidic solutions. Found around places that pump out a lot of co2. Found when acid rain dissolves the sandstone as it flows. Oxygen combines with iron to form iron oxide. Water increases the speed of the reaction. Important in decomposing ferromagnesium minerals like olivine, pyroxene, hornblende, and biotite. Iron released by weathering and combines with oxygen to form iron oxide. Take minerals that contains no water, force water into structure, change mineralogy: oxidation. The reaction of any substance with water. A hydrogen ion attacks and replaces another ion. Results in dissolved ions and solid products.

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