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First-Order Reaction Concentration Calculator

First-Order Reaction Concentration Calculator

First-Order Reaction Concentration Calculator

Calculate the concentration of a species in a first-order reaction using:
\[ [A] = [A]_0\,\exp(-kt) \]

* Enter the initial concentration [A]₀, the rate constant k (s⁻¹), and the time t (s).

Step 1: Enter Parameters

Example: 1 mol/L

Example: 0.1 s\(^{-1}\)

Example: 10 s

Formula: \( [A] = [A]_0\,\exp(-kt) \)


Practical Example:
If the initial concentration is 1 mol/L, the rate constant is 0.1 s\(^{-1}\), and the reaction is allowed to proceed for 10 s, then:
\[ [A] = 1 \times \exp(-0.1 \times 10) = \exp(-1) \approx 0.3679\, \text{mol/L} \]

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