Pseudo 1ª Ordem
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
pseudo
About this calculator
The Pseudo 1st Order is a tool used to calculate the observed rate constant based on the concentration of excess reagent. This formula is useful for chemical systems that do not follow the expected order of reaction, but exhibit pseudo-ordinary behavior.
The used formula is k_obs = k·[B]₀, where k_obs is the observed rate constant, k is the true rate constant and [B]₀ is the initial concentration of excess reagent.
This tool is important in complex chemical systems, such as catalytic reactions or reactions involving complex formation. Additionally, it is useful for identifying measurement errors or counting problems in reaction experiments.
Remember that the Pseudo 1st Order is only an approximation and should not be used in systems that exhibit truly complex behavior.
Frequently asked questions
What is Pseudo 1st Order?
Pseudo 1st Order is a tool that calculates the observed rate constant based on the concentration of excess reagent.
When to use Pseudo 1st Order?
Use Pseudo 1st Order when you have a chemical system that does not follow the expected order of reaction, but exhibits pseudo-ordinary behavior.
How does Pseudo 1st Order work?
Pseudo 1st Order uses the formula k_obs = k·[B]₀ to calculate the observed rate constant.
What is the true rate constant?
The true rate constant (k) is the rate constant that represents the true chemical behavior of the system.
What is excess reagent?
Excess reagent is the additional concentration of reagent that is not consumed in the reaction.