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Calcimator

Reaction Rate Calculator

Calculate reaction rate from rate constant, reactant concentrations, and reaction orders using the rate law equation.

Inputs

M
M

Results

Reaction Rate

0.0075 M/s

Overall Reaction Order2
Half-Life (if applicable)0 s
How to Use This Calculator
  1. Enter the rate constant (k), concentrations of A and B, and reaction orders with respect to A and B.
  2. Review Reaction Rate (M/s) and Overall Reaction Order.
  3. Use this to predict how concentration changes affect reaction speed.

How the result changes with Order with respect to B

Order with respect to BReaction Rate
0.50.01369 M/s
1.750.00304 M/s
3.250.0005 M/s
4.50.00011 M/s

What each input means

Rate Constant (k)
Rate constant — units depend on overall reaction order
Concentration of A
Molar concentration of reactant A
Concentration of B
Molar concentration of reactant B (set to 0 if only one reactant)
Order with respect to A
Reaction order for reactant A (0 = zero order, 1 = first order, 2 = second order)
Order with respect to B
Reaction order for reactant B (set to 0 if rate is independent of B)

How this is calculated

Formula

Rate = k × [A]^m × [B]^n

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Rate Constant (k) = 0.05, Concentration of A = 0.5, Concentration of B = 0.3, Order with respect to A = 1 = 5 input(s) provided
  2. Calculate Reaction Rate
    Reaction Rate = k
    0.0075 = 0.0075
  3. Calculate Overall Reaction Order
    Overall Reaction Order
    2 = 2
  4. Calculate Half-Life
    Half-Life
    0 = 0

Engine last updated . Checked against 3 independently-derived tests — how we verify calculators.

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