endothermic reaction

reaction of barium hydroxide octahydrate crystals with dry ammonium chloride
dissolving ammonium chloride in water
reaction of thionyl chloride (SOCl2) with cobalt(II) sulfate heptahydrate
mixing water and ammonium nitrate
mixing water with potassium chloride
reacting ethanoic acid with sodium carbonate
photosynthesis

"Ethanoic acid + sodium carbonate" is endothermic.
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