Water from the hypolimnion of a lake has a pH of 8, and CT is measured as 1.5 mM. The DO is zero. a. Would this water lose or gain CO2 if it were brought into contact with the atmosphere? b. Is your result in (a) consistent with your understanding of the lake ecosystem? Explain very briefly. c. If 1 mmol/liter of nitrate ) is added to the lake, as part of an unusual treatment intended to oxidize large accumulations of organic matter in the lake, how much will this alter CT, after denitrification (to nitrogen gas) is complete?