Table of Contents
Why the enthalpy of neutralization of strong acid and strong base is always the same?
Enthalpy of neutralization is always constant for a strong acid and a strong base: this is because all strong acids and strong bases are completely ionized in dilute solution. Enthalpy changes in neutralization are always negative-when an acid and alkali react, heat is given out.
Is the enthalpy of neutralisation of acetic acid the same as that of HCl if not why?
If not why? Answer. Acetic acid is a weak acid and is not completely ionised. Hence the net heat evolved is less and not the same as that of HCl which is completely ionised.
Why do weak acids have lower enthalpy of Neutralisation?
The overall energy change for the neutralisation reaction is the energy released by the formation of the water molecules minus the energy required to dissociate the molecules of the weak acid. The weaker the acid, the lower the value of the enthalpy change.
How do you calculate the heat of neutralization of acetic acid and NaOH?
ΔH = +5.3kJmol−1.
Why is the enthalpy of neutralization of CH3COOH by NaOH less than HCl?
Enthalpy of neutralization of CH3COOH by NaOH is less than that of HCl by NaOH. Because Enthalpy of neutralization C OOH by NaOH is less than that of HCl by NaOH. Because C OOH is less because of the absorption of heat in the ionization process.
What is the formula for heat exchange between NaOH and HCl?
HCl (aq) + NaOH (aq) –> NaCl (aq) + H2O (l) + Energy Thermochemistry determine the heat exchanged at constant pressure, q = m c ∆T. Calculating the limiting reactant, the change in enthalpy of the reaction, ∆Hrxn, can be determined since the reaction was conducted under conditions of constant pressure
How do you determine the molar enthalpy of neutralisation?
In an experiment to determine the molar enthalpy of neutralisation, 50.0 mL of 1.0 mol L -1 NaOH (aq) is placed in the styrofoam cup. The temperature of the NaOH (aq) is recorded. 1.0 mol L -1 HCl (aq) at the same temperature is added 10.0 mL at a time. The reaction mixture is stirred between each addition.
What is the balanced chemical equation for the neutralization of hydrochloric acid?
The balanced chemical equation representing the neutralization of hydrochloric acid with sodium hydroxide is: HCl (aq) + NaOH (aq) → NaCl (aq) + H2O (l) + heat. Since theses are dilute solutions and are mostly water, assume that the densities of the solutions and the specific heat capacities of the solutions are approximately 1.0 g/ml