-->

Thermodynamics

Question
CBSEENCH11006194

Define enthalpy of neutralization.

Solution
Neutralisation enthalpy is the enthalpy change per mole of H2O that is formed on neutralisation of an acid with a base.
(i) Neutralisation enthalpy of HCl and NaOH is -57.1 kJ
   HCl left parenthesis aq right parenthesis space plus space NaOH left parenthesis aq right parenthesis space space space rightwards arrow space space space NaCl left parenthesis aq right parenthesis space plus space straight H subscript 2 straight O space left parenthesis straight l right parenthesis
space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space increment subscript straight n straight H to the power of 0 space equals space minus 57.1 space kJ
(ii) Neutralisation enthalpy of CH subscript 3 COOH and NaOH is  -55.2 kJ
                               stack CH subscript 3 COOH left parenthesis aq right parenthesis with Acetic space acid below space plus NaOH left parenthesis aq right parenthesis rightwards arrow CH subscript 3 COONa left parenthesis aq right parenthesis plus straight H subscript 2 straight O left parenthesis straight l right parenthesis
space increment subscript straight n straight H to the power of 0 space equals space minus 55.2 space kJ