11The atmosphere on a distant planet is entirely carbon dioxide at a pressure of 1520 torr (2 Earth atmospheres). What would the pH of a lake on this planet be if both the hydronium ion and hydrogen carbonate concentrations were determined by the dissolved carbon dioxide? Henry’s law constant for CO2= 0.030 M/atm.pK1for carbonic acid (H2CO3) = 6.37[CO2] = 1000 [H2CO3]If you mastered the information presented on Monday, this problem, which was asked by a student in class, should be “a piece of cake”!A) 5.3 B) 3.1 C) 3.5 D) 4.1 E) 8.52x-6.0x10x10xx x -M106.0xx x -00atm)M/atm)(2(0.03010001HCOOH0HCOH5-26.37-5--33232xIf you neglect x in the denominator, you find x = 5.1x10-6and pH = 5.29.Note 6.0x10-5/ 5.1x10-6= 11.8If you do the quadratic equation thing, you find x = 5.3x10-6and pH = 5.28.
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