How do you use steady state approximation?

Normally the requirements for applying the steady state approximation are laxer: the concentration of the intermediate is only needed to be low and more or less constant (as seen, this has to do only with the rates at which it appears and disappears) but it is not needed to be at equilibrium.

When can you apply the steady state approximation?

The steady state approximation is applies to a consecutive reaction with a slow first step and a fast second step (k1≪k2). If the first step is very slow in comparison to the second step, there is no accumulation of intermediate product, such as product B in the above example.

What are the conditions for the steady state approximation theory?

The steady state approximation assumes that the concentration of reaction intermediates remains constant throughout the reaction. The concentration of reaction intermediates is assumed to be steady because the intermediates are being produced as fast as they are consumed.

What is equilibrium approximation?

The pre-equilibrium approximation is used to find the rate law for a reaction with a fast and reversible initial step. In this method, we first write the rate law based on the slow (rate-determining) step.

What is a steady state process?

In chemistry, thermodynamics, and other chemical engineering, a steady state is a situation in which all state variables are constant in spite of ongoing processes that strive to change them. A steady state flow process requires conditions at all points in an apparatus remain constant as time changes.

What is the formula for first order reaction?

First-Order Reactions A first-order reaction depends on the concentration of one reactant, and the rate law is: r=−dAdt=k[A] r = − dA dt = k [ A ] .

Which equation is correct for first order reaction?

For first-order reactions, the equation ln[A] = -kt + ln[A]0 is similar to that of a straight line (y = mx + c) with slope -k.

What is the pre-equilibrium approximation requires the first step to be?

The steady state method can only be used if the first step of a reaction is much slower than the second step, whereas the pre-equilibrium approximation requires the first step to be faster.