Cinética 1ª ordem
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
1ª ordem
About this calculator
The 1st order concentration calculator is a useful tool for calculating the concentration of a substance in a 1st order chemical reaction that follows the equation [A] = [A]₀·e^(−kt), where [A] is the final concentration, [A]₀ is the initial concentration, k is the reaction rate constant and t is the time.
This calculator is designed to help solve problems of 1st order chemical kinetics, such as determining the concentration of a substance at a given time, or calculating the reaction rate constant.
The equation [A] = [A]₀·e^(−kt) is the basis of this calculator, and it can be used in a variety of situations, from chemical reactions in the laboratory to industrial processes.
However, it's essential to remember that this calculator is just a tool and cannot replace the theoretical and practical understanding of chemical kinetics.
Frequently asked questions
What is the order of a chemical reaction?
The order of a chemical reaction is the exponent of time at which the concentration of a substance decreases. In a 1st order reaction, the concentration decreases by a factor of 2 in a given time, in a 2nd order reaction, the concentration decreases by a factor of 4 in a given time, and so on.
How do I choose the correct value for the reaction rate constant (k)?
The value of k depends on the type of chemical reaction and the specific conditions in which it is occurring. It's essential to consult tables or graphs of experimental data to obtain the correct value of k for a specific reaction.
Can the calculator be used to calculate the concentration of a substance in a multi-order reaction?
No, this calculator is designed for 1st order reactions and cannot be used to calculate the concentration of a substance in a multi-order reaction.
What is the initial concentration ([A]₀)?
The initial concentration is the value of the concentration of the substance at the beginning of the reaction, before the reaction starts to occur.
Can I use this calculator to calculate the concentration of a substance in an industrial-scale reaction?
Yes, this calculator can be used to calculate the concentration of a substance in an industrial-scale reaction, as long as the specific conditions of the reaction are known and the correct value of k is used.