Barium Hydroxide and Ammonium Thiocyanate (Endothermic)

Ba(OH)2·8H2O + 2NH4SCN → Ba(SCN)2 + 2NH3 + 10H2O

Descripción general

This highly endothermic acid-base reaction absorbs so much heat that it can freeze water beneath the flask. Mixing barium hydroxide octahydrate with ammonium thiocyanate drops the temperature below -20 C. The ammonium ion acts as a weak acid donating protons to hydroxide.

Participantes

Rol Sustancia Coeficiente Estado
Producto Ammonia NH₃ 2 (g)
Producto Water H₂O 10 (l)

Ejemplo cotidiano

This is one of the most dramatic endothermic reaction demonstrations, where a wet board freezes to a beaker as the reaction proceeds.

Importancia industrial

Esta reacción se utiliza principalmente como demostración didáctica de procesos endotérmicos y reacciones impulsadas por la entropía, ilustrando el concepto termodinámico de ΔG = ΔH - TΔS.

Propiedades

Tipo
Acid-Base
Reversible
No
Energía
Endotérmico
ΔH
170,0 kJ/mol

Reacciones relacionadas

Hydrochloric Acid and Barium Hydroxide Acetic Acid and Sodium Acetate Buffer System Acetic Acid Dissociation in Water Ammonia and Hydrochloric Acid Ascorbic Acid and Sodium Hydroxide Carbonic Acid and Sodium Hydroxide Aluminum Hydroxide as Amphoteric Acid with NaOH Aluminum Chloride and Chloride Ion (Lewis Acid-Base) Acetic Acid and Sodium Hydroxide Neutralization Formic Acid and Sodium Hydroxide

Frequently Asked Questions

What is the equation for Barium Hydroxide and Ammonium Thiocyanate (Endothermic)?
The balanced equation is: Ba(OH)₂·8H₂O + 2NH₄SCN → Ba(SCN)₂ + 2NH₃ + 10H₂O.
What type of reaction is Barium Hydroxide and Ammonium Thiocyanate (Endothermic)?
Barium Hydroxide and Ammonium Thiocyanate (Endothermic) is a acid-base reaction.
Is Barium Hydroxide and Ammonium Thiocyanate (Endothermic) exothermic or endothermic?
Barium Hydroxide and Ammonium Thiocyanate (Endothermic) is endothermic (absorbs energy). The enthalpy change (ΔH) is 170.0 kJ/mol.