Question

Describe the graphical representation of first order reaction.

Answer 1

Rate constant for first order reaction is,

kt = ln `((["A"_0])/(["A"]))`

kt = In [A₀] – In [A]

In [A] = In [A₀] – kt

y = c + mx

If we follow the reaction by measuring the concentration of the reactants at regular time intervals ‘t’, a plot of ln [A] against ‘t’ yields a straight line with a negative slope. From this, the rate constant is calculated.

A plot of ln [A] Vs t for a first order reaction, \[\ce{A -> product}\] with initial concentration of [A] = 1.00 M and k = 2.5 × 10⁻² min⁻¹