Rate Constant Calculator

Calculate the rate constant (k) of a chemical reaction using measured rate and concentration values.

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Calculation Parameters

Adjust the values below.

1.09.9
-50
0.01 M2.00 M
0.01 M2.00 M
02
02

Calculated Result

Rate Constant (k) 0.10 M⁻¹s⁻¹
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Expert Tip

Ensure units are correctly formatted (e.g. Kelvin for gas temperatures and liters for volumes) to get chemically accurate outputs.

How this Calculator Works

This calculator allows you to solve Rate Constant problems dynamically. Adjust the input parameters using the sliders or selection menu below:

  • Reaction Rate - Coefficient (Range: 1.0 to 9.9, Default: 1.0)
  • Reaction Rate - Exponent (10^x) (Range: -5 to 0, Default: -3)
  • Reactant [A] (M) (Range: 0.01 to 2.00, Default: 0.10)
  • Reactant [B] (M) (Range: 0.01 to 2.00, Default: 0.10)
  • Order of A (x) (Range: 0 to 2, Default: 1)
  • Order of B (y) (Range: 0 to 2, Default: 1)

The results are computed instantly and updated in the results panel on the right.

Formula & Methodology

Rate = k * [A]^x * [B]^y
k = Rate / ([A]^x * [B]^y)

Where:

  • Reaction Rate - Coefficient: Parameter value.
  • Reaction Rate - Exponent: Parameter value.
  • Reactant [A]: Parameter value.
  • Reactant [B]: Parameter value.
  • Order of A: Parameter value.
  • Order of B: Parameter value.

Step-by-Step Calculation Example

To calculate Rate Constant manually, follow these steps:

  1. Identify the input parameters. For example:
    • Reaction Rate - Coefficient = 1.0
    • Reaction Rate - Exponent (10^x) = -3
    • Reactant [A] (M) = 0.10
    • Reactant [B] (M) = 0.10
    • Order of A (x) = 1
    • Order of B (y) = 1
  2. Apply the formula:
    Rate = k * [A]^x * [B]^y
    k = Rate / ([A]^x * [B]^y)
  3. Verify the calculated value which is updated instantly in the results panel on the right.

Frequently Asked Questions

What is a rate constant (k)?

The rate constant k is a proportionality constant in the rate law equation relating reaction rate to reactant concentrations.

What are the units of a 1st order rate constant?

A first-order rate constant has units of inverse time (s⁻¹ or min⁻¹).

Does rate constant change with reactant concentration?

No, k is independent of reactant concentration, but changes with temperature and presence of catalysts.

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