We shall determine these equations only for zero and
first order chemical reactions Zero order reaction means that the rate of the reaction is proportional
to zero power of the concentration of reactants Consider the reaction,
R ® P
Rate = 



0
d R
R
d
k
t


As  any quantity raised to power zero is unity
Rate = 

d R
1
d
k ×
t


d[R] = – k dt
Integrating both sides
[R]
= – k t + I
(3 5)
where, I is the constant of integration