Rate Constant Calculator

Your details

Use the integrated method when you have concentration-time data. Use the experimental method when you measured the reaction rate directly.
The overall order with respect to reactant A. Check the rate law for your reaction to confirm.
Concentration of reactant A at time zero, in mol/L (M).
M
Concentration of reactant A after time t.
M
Elapsed time in the selected unit.
s
Rate constant (k)
0.01386 s⁻¹

The rate constant for the reaction at the given conditions.

k (numeric)0.013863
Half-life (t₁/₂)50.00 s
Half-life (s)50
Reaction order1
Initial rate0.0139 M/s
0.013863 s⁻¹
Very slow<0.001Slow0.001-0.01Moderate0.01-0.1Fast0.1+

Rate constant k = 0.01386 s⁻¹

  • This is a first-order reaction, meaning the rate is directly proportional to the concentration of A.
  • The half-life is 50.00 s, which is constant regardless of concentration (a hallmark of first-order kinetics).
  • 75.0% of reactant A was consumed over the measured time interval.

Next stepTo check your result, substitute k back into the rate law and verify it reproduces the observed concentrations or rate. The Arrhenius equation (k = A·e^(-Ea/RT)) can link this k to the activation energy if measurements at two temperatures are available.

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