Seawater_Bonus_Fall2010 (due by Nov 2)

# Seawater_Bonus_Fall2010 (due by Nov 2) - The Seawater Bonus...

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The Seawater Bonus Problem: Due by November 2 (Tuesday) Remember that in water CO 2 (aq) = H 2 CO 3 (aq) For this reason CO 2 dissolved in seawater is usually referred to as CO 2 * K H = [CO 2 * ] / pCO 2 where pCO 2 is the atmospheric partial pressure of CO 2 K H is the Henry’s Law constant For CO 2 , the value of K H is 3.4 x 10 -2 Currently, CO 2 is 387 ppm by volume in the Earth’s atmosphere, and therefore the partial pressure pCO 2 is 0.000387 atmospheres. Most projections estimate that due to fossil fuel consumption (and other contributing sources), the concentration of CO 2 in the atmosphere will double by the year 2100. In water: H 2 CO 3 HCO 3 - + H + K a1 = 4.3 x 10 -7 HCO 3 - CO 3 2- + H + K a2 = 4.8 x 10 -11 The current pH of seawater is ~8.2

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If by the year 2100 current predictions are correct and the pCO 2 doubles, what will then be the average pH of the ocean?
The van’t Hoff equation can be expressed as follows: C = 2400 for CO 2 k(T) means k at temperature T k(T

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Seawater_Bonus_Fall2010 (due by Nov 2) - The Seawater Bonus...

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