What is a Second-Order Reaction?
A second-order reaction is a reaction where the rate depends on either:
- The concentration of one reactant squared
- The product of the concentrations of two different reactants
Calculate Second-Order Reaction Kinetics
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Calculate the rate constant (k) for a second-order reaction
Calculate concentration at any time for a second-order reaction
Calculate the half-life of a second-order reaction
A second-order reaction is a reaction where the rate depends on either:
Two common types of second-order rate laws:
Rate = k[A]² (single reactant)
Rate = k[A][B] (two reactants)
For a single reactant second-order reaction:
1/[A] = 1/[A]₀ + kt
[A] = [A]₀/(1 + kt[A]₀)
Unlike first-order reactions, the half-life depends on initial concentration:
t₁/₂ = 1/(k[A]₀)
For a second-order reaction:
Rate = k[A]²
1/[A] = 1/[A]₀ + kt
t₁/₂ = 1/(k[A]₀)