Reaction Order Calculator

Reaction Order Calculator computes the reaction order and rate constant for the reaction A+B→products. Enter two sets of experimental data (concentrations and rates), select units, and view detailed results.

How to Use Reaction Order Calculator:

1. Enter the initial concentrations of reactants A and B and the initial rates for two experiments using the keypad or direct input; use “Next” to switch fields.
2. Select appropriate units for concentrations (M, mM) and rates (M/s, mM/s).
3. Ensure one reactant’s concentration changes between experiments while the other remains constant for accurate order calculation.
4. Click “Calculate” to see step-by-step results.
5. Use “Share Result” to get shareable text or “Copy Result” to copy to clipboard.

Formulas:

Rate Law:

Order with respect to A (m):

Order with respect to B (n):

Rate Constant (k):

Where: [A], [B] = concentrations (mol/L), Rate = initial rate (mol/L·s), m, n = reaction orders, k = rate constant

Important Notes:

• Inputs for concentrations and rates must be positive numbers. Rates must be non-zero.
• For accurate results, ensure [B] is constant when calculating m, and [A] is constant when calculating n between experiments.
• Results are rounded to two decimal places for reaction orders and four for the rate constant.
• Clipboard access requires a secure context (HTTPS). If copying fails, try accessing over HTTPS or copy manually.