NH₄Cl in water is an endothermic reaction.
Any process that increases the system's internal energy U (enthalpy H) is considered an endothermic reaction. A closed system typically absorbs thermal energy from its surroundings during such a process, which causes heat transfer into the system.
A basic solution is created when ammonia and water are combined. Ammonium hydroxide is created when a little amount of dissolved ammonia combines with water. This compound then breaks down into ammonium and hydroxide ions. These procedures can all be reversed. Heating the system favors the opposite direction for both reactions. Though it is a spontaneous process, the endothermic reaction of ammonium chloride dissolves in water.
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