Reaction Rate Constant

Compute rate constant k for first‑order or second‑order reactions.

Order:

Initial concentration C₀ (M)

Concentration at time t, C (M)

Time t (seconds)

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s⁻¹

First-order: k = (1/t) ln(C₀/C)

Second-order (same reactant): k = (1/t) (1/C – 1/C₀)