How to Use the Rate Law Calculator
This calculator allows you to compute the rate of a chemical reaction based on the rate law. Follow these steps:
- Select the Reaction Type from the dropdown menu.
- Enter the Rate Constant (k) and select its units.
- Input the concentrations of reactants A (and B, if applicable) and select their units.
- Specify the Order of Reaction with respect to reactants A and B, if applicable.
- Optionally, choose a variable to plot the reaction rate against.
- Click the Calculate Rate button to compute the reaction rate.
- The calculated rate, total order of reaction, and detailed calculation steps will be displayed.
Example Calculations
Example 1: First-Order Reaction
- Reaction Type: First-Order Reaction
- Rate Constant (k): 0.5 1/s
- Concentration of Reactant A ([A]): 0.2 mol/L
Calculation:
Rate = k × [A]1
Rate = 0.5 × 0.21 = 0.1 mol/(L·s)
Example 2: Second-Order Reaction
- Reaction Type: Second-Order Reaction
- Rate Constant (k): 0.1 L/(mol·s)
- Concentration of Reactant A ([A]): 0.1 mol/L
- Concentration of Reactant B ([B]): 0.2 mol/L
Calculation:
Rate = k × [A]1 × [B]1
Rate = 0.1 × 0.11 × 0.21 = 0.002 mol/(L·s)
Example 3: Custom Order Reaction
- Reaction Type: Custom Order Reaction
- Rate Constant (k): 2 L²/(mol²·s)
- Concentration of Reactant A ([A]): 0.5 mol/L
- Order of Reaction with respect to A (m): 2
- Concentration of Reactant B ([B]): 0.3 mol/L
- Order of Reaction with respect to B (n): 1
Calculation:
Rate = k × [A]m × [B]n
Rate = 2 × 0.52 × 0.31 = 0.15 mol/(L·s)
Additional Information
Ensure that you input positive numbers for the concentrations and rate constants. Reaction orders should also be non-negative numbers.
If you encounter any errors, please check that all required fields are filled in correctly.
