Acids, equilibrium & kinetics · HL

Arrhenius Eₐ (HL)

Estimate activation energy from two rate constants.

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Number formats & units

Use decimal dots in datasets. Single values also accept decimal commas and scientific notation such as 1.2e-3 or 1.2 × 10⁻³.

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Example

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\ln\!\left(\frac{k_2}{k_1}\right)=-\frac{E_{\mathrm a}}R\left(\frac1{T_2}-\frac1{T_1}\right)

k=Ae^{-E_{\mathrm a}/(RT)}

What the variables mean

Symbol	Meaning
$E_{A}$	Activation energy.
$A$	Pre-exponential factor in the same units as k.

43.32269 kJ mol⁻¹

Follow the example steps

Convert both temperatures to kelvin.

20 °C, 30 °C: 1/20 − 1/30

293.15 K, 303.15 K: 1/293.15 − 1/303.15

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Method notes

This two-point form assumes an Arrhenius model over the temperature interval. A multi-point plot of ln k against 1/T is usually stronger evidence.