Why is the molar heat in a reaction between HCl and NaOH greater than in a...

Why is the molar heat in a reaction between HCl and NaOH greater than in a reaction between HOAc and NaOH

Solutions

Expert Solution

HCl + NaOH -------> NaCl + H2O H = -57.3kj/mole

they are dissociate as

H⁺+Cl^- + Na⁺+OH^- -------> Na⁺+Cl^- + H2O H = -57.3kj/mole

net ionic equation

H⁺ + OH^- ---------> H2O(l) H = -57.1kj/mole

Ethanlphy of strong acid and strong base is constant. Strong acid and strong base are completely ionisable.

CH3COOH + NaOH -------> CH3COONa + H2O

NaOH------> Na⁺ + OH^-

acetic acid is weak acid it is incompletely dissociate.

CH3COOH <-------> CH3COO- + H⁺ equlibrium

completely dissociation of acetic acid some amount of energy is required.

The heat of energy of NaOH and CH3COOH is less than -57.3 kj/mole

The enthalphy of dissociation of acetic acid is 1.9kj/mole

CH3COOH + NaOH -------> CH3COONa + H2O H = -57.1-1.9 = 55.2 kj/mole

queen_honey_blossom answered 1 year ago

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