HALOGENATION OF PROPANONE

Review

Overall Reaction	Pk + I2 → PI + H+ + I-
Proposed Mechanism

Given that (for the results obtained from the CH213 - Halogenation of Propanone experiment) a plot of [I₂] vs Time will be linear, with Slope = -k₀ = -(-d[I₂]/dt), it makes sense to derive the Experimental Rate Expression in the form of -d[I₂]/dt = . . .

Overall Rate of Consumption of Iodine {-d[I₂]/dt}

For the proposed mechanism

The overall rate of consumption of iodine can be expressed as

-d[I₂]/dt = + k₁[H⁺][P_k] + k_-1[P_e][H⁺] + k₂[P_e][I₂]

-d[I₂]/dt = - k₂[PI][H⁺][I^-]

-d[I₂]/dt = + k₂[P_e][I₂]