3. You collected a lake water sample in a glass bottle and measured the pH as 6.7 at 25 °C. You mistakenly exposed your

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3 You Collected A Lake Water Sample In A Glass Bottle And Measured The Ph As 6 7 At 25 C You Mistakenly Exposed Your 1 (72.47 KiB) Viewed 83 times

3. You collected a lake water sample in a glass bottle and measured the pH as 6.7 at 25 °C. You mistakenly exposed your sample to full sunlight when you brought back to the laboratory because you put your sample in a glass bottle. Unfortunately, Photosynthesis occurred in the sample. Upon arrival at the laboratory, the sample pH was found to be changed to 9.4 and the atmosphere above the sample (i.e., the head space of the glass bottle) contained 35% (v/v) oxygen (i.e., Po2 = 0.35 atm) at the same temperature. Assuming that the oxygen reduction half- reaction governed the redox conditions in the sample, what was the change in pe of your sample? Po2 in the atmosphere = 0.21 atm (30 pt) O2(g) + 4e + 4H* . → > 2H₂O peº = +20.8