Exam_3_2005 - Key Exam 3 2005 1) i) As CO2 increases in the...

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Key Exam 3 2005 1) i) As CO 2 increases in the atmosphere more carbonic acid is formed in rainwater which makes it more acidic (lowers the pH) and increases the rate of weathering. CaCO 3 (s) + H 2 CO 3 (aq) Ca +2 (aq) + 2HCO 3 - (aq) ii) As CO 2 increases in the atmosphere m ore carbonic acid is formed in the ocean which makes it more corrosive to calcite. Look at equilibrium equation below for shell formation. As you increase H 2 CO 3 you drive the system to dissolve the CaCO 3 . Ca +2 (aq) + 2HCO 3 - (aq) CaCO 3 (s) + H 2 CO 3 (aq) iii) CO 2 dissolve in rainwater to make the weak acid H 2 CO 3 CO2(g) + H 2 O H 2 CO 3 (aq) iv) The biological pump removes atmospheric CO 2 to the deep ocean via photosynthesis in the photic zone followed by respiration of organic material below. v) The calcite that collects on the ocean floor will be recycled to CO 2 via subduction of the oceanic plate. The time scale is of the order of 100 million years. 2.
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This note was uploaded on 02/08/2011 for the course EAS 1600 taught by Professor Jimstjohn during the Fall '08 term at Georgia Institute of Technology.

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Exam_3_2005 - Key Exam 3 2005 1) i) As CO2 increases in the...

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