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Enthalpy Change of Neutralization

May 4, 2013

Enthalpy is a term used in thermodynamics and also in chemical reactions..

Neutralization is a reaction in which an acid and a base combine to form water.

HA + BOH —–> AB + H2O

Introduction to Enthalpy change of neutralization:

Enthalpy change of neutralization is enthalpy change during the neutralization reaction.

All acids have H+ bonded to the conjugate base. Similarly all bases have the OH ion bonded to the conjugate acid. These bonds have certain energies of formation. It is released when bonds are broken.

In the neutralization reaction, these bonds are broken and new bonds in between the H+ andOHis formed which is accompanied by consumption of energy.

The difference between the energy released and energy consumed is enthalpy change of neutralization

Enthalpy change is dependent on pressure, temperature and surrounding factors too.

The standard enthalpy change of a neutralization reaction is enthalpy change at standard conditions (298 K and 1 atm) for the formation of one mole of water.

If the change is negative, then it is called exothermic, and if it is positive, it is called as endothermic reaction.

Measurement of enthalpy change of neutralization

It is not possible to measure the  enthalpy change of neutralization directly but it could be measured by the use of calorimeter.

The calorimeter when immersed in the ongoing reaction may show the change in enthalpy. It is calculated by the following formula:

In this equation  ‘c’ is the specific heat capacity of calorimeter, and ‘ΔT’ is change in the temperature measured by the calorimeter and ‘delta H’ is the change in enthalpy.

The change in enthalpy (ΔH) in SI units, is in joules and  the change in temperature (ΔT) is in kelvins.

Strong and weak acids and bases:


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