February 28, 2021, 04:35:31 AM
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Topic: Given that the average pH of clean, unpolluted rain today is 5.4, determine the  (Read 6080 times)

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Offline PhilipCheney

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I am not sure which direction i should go withthis. I can determine the concentration of H+ fromthe pH, but then what?

Atmospheric CO2 level seem to have risen by approximately 20% over the past 40 years from 315 ppm to 375 ppm.

(a) Given that the average pH of clean, unpolluted rain today is 5.4, determine the pH of unpolluted rain 40 years ago. You may assume that carbonic acid (H2CO3) formed by the reaction of CO2 and water is the only factor affecting pH by the reaction:

CO2(g) + H2O(l) <===> H2CO3(aq);

(b) What volume of CO2 at 25oC and 1 atm is dissolved in a 20.0-L bucket of today’s water?

Offline Borek

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I guess they want you to calculate concentration of acid from pH (and pKa1), to calculate Henry's constant from this number, then to do the opposite - use calculated Henry's constant to calculate pH of the solution for a lower level of CO2.
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