Will Rate quick Fertilizing the Sea to Combat Global Warming Some scientists hav

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Will Rate quick

Fertilizing the Sea to Combat Global Warming Some scientists have proposed adding Fe(ll) compounds to large expanses of the open ocean to promote the growth of phytoplankton that would in turn remove CO2 from the atmosphere through photosynthesis. The average pH of open ocean water is 8.1. a. What is the maximum value of [Fe3 n pH 8.1 seawater if the Ksp of Fe (OH)3 is 1.1 x 10 30? Number b. If you were to predict the solubility (s) of Fe(OH) in seawater using the equation Ke (mmx)s m*, would the prediction be accurate? O Yes O No, the prediction is higher O No, the prediction is lower

Explanation / Answer

since pH + pOH = 14
when the pH 8.1,
then the pOH = 5.9

& [OH-] = 10^-5.9
[OH-] = 1.26 e-6 molar


Fe(OH)3 <=> Fe+3 & 3 OH-

Ksp = [Fe+3] [OH-]^3

1.1 e-36 = [Fe+3] [ 1.26 e-6]^3

[Fe+3] = 1.1 e-36 / 1.995 e-18

Fe+3 = 5.5 e-19 Molar

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