Reaction with water produces carbon dioxide fizz.
Baking-soda and citric acid react with water to produce sodium citrate and carbon dioxide.
If the water is below 32 degrees and in ice form, then the reaction would be slowed, and/or stopped depending if there was surface moisture on the ice.
Between 32 degrees and boiling, it might be possible that higher temperature water with more actively moving molecules could penetrate more quickly, and disperse the CO2 quicker allowing reaction to be faster.
Above boiling, when water is in steam state, which might be hard to contain and maintain, the table would probably dissolve as water vapor condenses on surface, but it would probably take longer than immersing tablet into glass of water..
Pour very hot water into one glass.
Pour very cold water into another glass.
Drop a table into each glass and see if there is noticeable difference in time before the tablet dissolves.
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