sublimation from dry ice is a well-known phenomenon, which occurs at standard temperature and pressure. If water is accessible to the gaseous , it will dissolve in the water. Carbonic acid and bicarbonate ions form in the sequence of chemical equilibria: Dissociation of the carbonic acid causes the pH of the water to decrease.
 V. Ruz, M. M. Gonzalez, D. Winant, Z. Rodriguez and G. Van den Mooter, “Characterization of the Sublimation and Vapor Pressure of 2-(2-Nitrovinyl) Furan (G-0) Using Thermogravimetric Analysis: Effects of Complexation with Cyclodextrins.” Molecules, 20(8), 2015 pp. 15175–15191. doi:10.3390/molecules200815175.
Submission from the Compute-to-Learn course at the University of Michigan.