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Heat of Dilution

The amount of heat evolved or absorbed when solution containing one mole of solute is diluted from one concentration to another.
 
Example

diluting an acid with water to prepare a solution with lesser acid concentration.
 

Enthalpy or Heat of Neutralization

The amount of heat evolved when one gram equivalent of an acid is completely neutralized by one gram equivalent of a base in dilute solution is called heat of neutralization.
 
Example

HCl(aq) + NaOH(aq)  NaCl(aq) + H2O; ΔH = –13.7 kcal
 





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