Endothermic means the system or the reaction is absorbing heat or taking heat from the surrounding (solution). On the other hand, exothermic means the system would be releasing heat to the surrounding.
• If the surrounding (could be container, solution, etc.) is gaining heat, its temperature should increase, hence the surrounding would feel hot.
When ammonium chloride dissolves in water, the solution becomes colder.
Is the solution process exothermic or endothermic?
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