Barium Hydroxide and Ammonium Thiocyanate (Endothermic)

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

نظرة عامة

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.

المشاركون

الدور المادة المعامل الحالة
منتج Ammonia NH₃ 2 (g)
منتج Water H₂O 10 (l)

مثال من الحياة اليومية

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

الأهمية الصناعية

This reaction is primarily used as a teaching demonstration of endothermic processes and entropy-driven reactions, illustrating the thermodynamics concept that ΔG = ΔH - TΔS.

الخصائص

النوع
Acid-Base
قابل للعكس
لا
الطاقة
ماص للحرارة
ΔH
170,0 kJ/mol

التفاعلات ذات الصلة

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.