# Solubility of glucose

On eating powdered glucose I felt a cold sensation in my mouth. Then I thought it would be a result of the reaction between saliva and glucose. Then I thought that this would imply that the reaction would be endothermic. I don't find myself to be pretty sure and need to know whether I am right or not. Why would the reaction be endothermic in spite of the fact that glucose is readily soluble in saliva?

• Was this chemically pure glucose? – Lighthart Aug 24 '16 at 20:08
• Why do you think dissolving something that is readily soluble can't be endothermic? – Michael DM Dryden Aug 25 '16 at 2:09
• Dissolution can certainly be endothermic. Whether a reaction happens is controlled by $\Delta G$ not $\Delta H$ – orthocresol Aug 25 '16 at 5:06
• It was glucose-d and 99.4% pure.Do molecules use my mouth's heat tobreak their bonds and get salivated and as a result the cold sensation? – Pewpaled Aug 25 '16 at 13:02