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THE GEOCHEMISTRY OF NATURAL WATERS

2. LEARNING OBJECTIVES. Define oxidation and reduction.See examples of the importance of redox reactions to aqueous geochemistry.Learn to balance redox reactions.Define the variables Eh and pe.Learn how to calculate Eh from redox couples.Learn how to measure Eh in the field and understand the p

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THE GEOCHEMISTRY OF NATURAL WATERS

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    1. 1 THE GEOCHEMISTRY OF NATURAL WATERS REDOX REACTIONS AND PROCESSES - I CHAPTER 5 - Kehew (2001) The Nernst equation

    2. 2 LEARNING OBJECTIVES Define oxidation and reduction. See examples of the importance of redox reactions to aqueous geochemistry. Learn to balance redox reactions. Define the variables Eh and pe. Learn how to calculate Eh from redox couples. Learn how to measure Eh in the field and understand the pitfalls of such measurements.

    3. 3 CALCULATING Eh FROM A REDOX COUPLE Consider the half reaction: NO3- + 10H+ + 8e- ? NH4+ + 3H2O(l) We can use this reaction, together with the Nernst equation to calculate the Eh, if the activities of H+, NO3-, and NH4+ are known. The general Nernst equation is The Nernst equation for this reaction at 25°C is

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