How to use the reaction rate law calculator
Compute reaction rate from rate constant and concentrations. Enter rate constant k, [a], order in a, [b], order in b in the fields above; the rate, overall order are computed instantly and plotted on the chart so you can see how the answer changes.
Formula
Variables
- k — Rate constant k
- A — [A] (mol/L)
- a — Order in A
- B — [B] (mol/L)
- b — Order in B
Worked example
With rate constant k = 0.05, [a] = 0.4 mol/L, order in a = 1, [b] = 0.2 mol/L, order in b = 1, the calculator gives rate ≈ 0.004 mol/(L·s); overall order ≈ 2.
Frequently asked questions
What is the formula for the reaction rate law calculation?
Rate (mol/(L·s)) = k × A^a × B^b. Overall order = a+b. Here k is rate constant k, A is [a] (mol/L), a is order in a, B is [b] (mol/L), b is order in b.
What inputs do I need for the reaction rate law calculator?
You need rate constant k, [a] in mol/L, order in a, [b] in mol/L, order in b. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use this calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.