Why is the measured enthalpy lower for weak acids like acetic acid?

Weak acids are only partially dissociated; some evolved thermal energy is consumed endothermically to dissociate the remaining weak acid molecules during titration.

Heat of NeutralizationChemistry

Heat of Neutralization & Solution Calorimetry Calculator

Calculate molar enthalpy of neutralization (ΔH neut in kJ/mol) from coffee-cup calorimetry data and benchmark against the standard strong acid-base constant (-57.3 kJ/mol).

Chemistry & Solutions Thermodynamics Calorimetry

Calculated Result

Molar Enthalpy of Neutralization

-58.08kJ/mol

Calculator Inputs

Total Solution Mass in Calorimeter (g)

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Solution Specific Heat Capacity (J/g°C)

J/g°C

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Initial Temperature

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Maximum Final Temperature

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Moles of Water Formed (mol)

mol

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Molar Enthalpy of Neutralization

-58.08kJ/mol

Total Heat Absorbed by Calorimeter (kJ)

2.9 kJ

Temperature Rise (ΔT)

6.7 °C

Exothermic Neutralization: Reflects thermal energy release from coordinate covalent bond formation between aqueous H+ and OH- ions.

Neutralization Calorimetry Profile

Heat q (kJ)

2.9 kJ(100%)

Enthalpy ΔH

-58.08 kJ/mol(0%)

Standard solution calorimetry and thermochemical measurement tool for acid-base reactions.

Calculation Methodology

Heat Evolved: q = (Mass * Specific Heat * ΔT) + (C_calorimeter * ΔT). Enthalpy of Neutralization: ΔH_neut = -q / Moles of H2O formed. Theoretical benchmark for strong acid-strong base is -57.3 kJ/mol.

Frequently Asked Questions

Because the net ionic reaction is universally identical: H+(aq) + OH-(aq) -> H2O(l). The spectator counterions do not participate in enthalpy exchange.

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Chemistry

Heat of Neutralization & Solution Calorimetry Calculator

Calculator Inputs

Neutralization Calorimetry Profile

Calculation Methodology

Frequently Asked Questions

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