Question

Give the correct thermochemical equations for a (cacl2+h2o) pack and (nh4no3+h2o) pack.

Answer 1

In a pack of CaCl2 and H2O, hydrolysis of Ca+2 will occur

This will result in formation of Ca(OH)2.

The reaction is exothermic in nature

so the balanced thermo-chemical equation will be

CaCl2(aq) + H2O (l)  ---> Ca(OH)2   + 2HCl + Heat

In a pack of NH4NO3 and H2O hydrolysis of NH4+ will occur as

NH4NO3 (aq)  + H2O(l)  + Heat ---> NH4OH(aq)  + HNO3 (aq)

It is an endothermic reaction