Enthalpy of neutralization is always a constant when a strong acid is neutralized by a strong base: account for the statement.

Answer

Strong acids and strong bases exist in the fully ionised form in aqueous solutions as below :
` H_(3) O^(+) +Cl^(-1) + NA^(+) + OH^(-) to Na^(+) + Cl+ 2H_(2) O`
`H_(3) O_((aq))^(+)+OH_((aq))^(-)to2H_(2)O(1)^(@)`
` Delta H^(@) = - 57 . 32 KJ. `
The`H^(+)` ions produced in water by the acid molecules exist as `H_(3)O^(+)` . Thus, enthalpy change of neutralisation is essentially due to enthalpy change per mole of water formed from `H_(3)O^(+)` and OH - ions . Therefore, irrespective of the chemical nature, the enthalphy of neutralisation of strong acid by strong base is a constant value which is equal to 57 . 32 KJ.