Cryogen from two solids

Endothermic reaction between hydrated barium hydroxide and ammonium chloride

Scientific name: Endothermic ion-exchange reaction between solid barium hydroxide and ammonium chloride

YouTube

A2 Unit 4 solids of ammonium chloride and barium hydroxide

by Tine Willis

reaction of barium hydroxide and ammonium chloride

by BerkeleyChemDemos

Endothermic reaction: very, VERY cool.

by MrBellScience

Barium hydroxide and ammonium chloride

by KnoleScience

Barium Hydroxide and Ammonium Chloride

by AAHS Chemistry Club

Ba(OH)2 + NH4Cl - Barium Hydroxide and Ammonium Chloride (Gas Evolution Reaction)

by The Organic Chemistry Tutor

An endothermic reaction between two solids: ammonium chloride + barium hydroxide

by David Read

Safety

Wear eye protection goggles.

Always follow general safety recommendations. Please note that conducting chemistry experiments you must comply with the relevant legal procedures in your country.

Reaction formula

Ba(OH)2*8H2O(s) + 2 NH4Cl(s) → 2NH3(g) + 10 H2O(l) + BaCl2(s)

or

Ba(OH)2*8H2O(s) + 2 NH4Cl(s) → 2NH3(g) + 8 H2O(l) + BaCl2*2H2O(s)

Step-by-step instruction

  1. Place 32 g of barium hydroxide-8-water into a beaker.
  2. Add 10 g of ammonium chloride into the beaker.
  3. Stir the resulting mixture.
  4. Pipette a few drops of water on a small wooden plaque. Put the beaker on it.
  5. Raise the beaker. The plaque should stick to it. It is also possible to measure the temperature of the reaction mixture. It should be about -25 degrees Celsius.

Scientific background

During this reaction, the two solids form a liquid and a gas. Based on this fact, it can be assumed that the change in entropy in this case will be positive, and will help the reaction to proceed. Thus, the temperature of the reaction can be positive or negative.

The thermal effect of the reaction can be calculated based on the standard enthalpies of formation of the materials. Depending on the assumptions about the product (BaCl2 or BaCl2*H2O), it is equal to 164 or 135 kJ / mol.

Danger:
Coolness:
Difficulty:

Published on 30 June 2015

  • Fire
  • Heating with fire
  • Explosion
  • Poisoned gas
  • Organic
  • Electricity
  • Solution
  • Oxidation reduction
  • Color change
  • Precipitate
  • Gassing
  • Catalyst