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26 Solubility - The atmosphere on a distant planet is...

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1 1 The 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 CO 2 = 0.030 M/atm. pK 1 for carbonic acid (H 2 CO 3 ) = 6.37 [CO 2 ] = 1000 [H 2 CO 3 ] 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) 8.5 2 x - 6.0x10 x 10 x x x - M 10 6.0 x x x - 0 0 atm) M/atm)(2 (0.030 1000 1 HCO O H 0 H CO H 5 - 2 6.37 - 5 - - 3 3 2 3 2 x If you neglect x in the denominator, you find x = 5.1 x 10 -6 and pH = 5.29. Note 6.0 x 10 -5 / 5.1 x 10 -6 = 11.8 If you do the quadratic equation thing, you find x = 5.3 x 10 -6 and pH = 5.28.
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