What is enthalpy of reaction for precipitation and enthalpy reaction for displacement.?
Enthalpy (change in) is the amount of heat (energy) transferred during a reaction. Precipitation and displacement are just different general kinds of reactions (in some cases the same kind of reaction). There is no difference in the definitions of enthalpy in these cases. A negative change in enthalpy means energy was released to the environment in the course of the reaction, and a positive change in enthalpy means energy was absorbed from the environment in the course of the reaction. Heres some examples.. Ag+ (aq) + Cl- (aq) ——> AgCl (s) Change in enthalpy = -65.5 kJ/mol This is a precipitation reaction…silver ions and chloride ions are reacting to form solid silver chloride. The negative change in enthalpy means that this reaction released energy into the environment. Displacement reactions can be tricky. Consider this reaction Pb(NO3)2 (aq) + 2 NaBr (aq) —–> 2 NaNO3 (aq) + PbBr2 (s) which is also a precipitation reaction. To solve this, you need to find the enthalpy of for
