Barium hydroxide and ammonium chloride is mixed.Is this reaction a exothermic or endothermic reaction?

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Solution

Ammonium chloride has ammonium (NH4 +) part which is slightly acidic and Barium Hydroxide is a strong base.

You can see that an acid-base reaction will occur.

In this case :

Its highly endothermic reaction

Forms aqueous ammonia (mind that ammonia is highly water soluble gas so no effervesence) and Barium Chloride which is water soluble.

Ba(OH)2 + 2NH4Cl = BaCl2 + 2NH3(g) + 2H2O(l)

Change in Enthalpy: ΔH(20C) = +105.1kJ (positive, so the reaction is endothermic)

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