Date:__________

5.1 Endothermic Reactions--Ba(OH)2 * H2O + NH4SCN

Chemical Concept(s) Demonstrated:____________

Demonstration:

  • Combine 16g of NH4SCN or NH4NO3 and 32 g of Ba(OH)2 * H2O in a 150 mL beaker.
  • Place the beaker on top of a damp wooden board.

Observations:









Explanation (include important chemical equation):

This demonstration is based on the reaction between an ammonium salt and barium hydroxide. The large increase in entropy of the system overcomes the endothermicity of the reaction and the overall reaction is therefore spontaneous.