810.2 Mechanism assumption and Approximate treatment 10.2.1 Approximation treatment of complex reaction mechanism (3)Pre-equilibrium approximation Azo reaction of aniline under catalysis of HBr H+HNO, +C> N2+2H,O r=k[HI[HNO,IBr Its mechanism is proposed as 1)H+HNO,HNo (rapid equilibrium 2)HNO,+Br->NOBr+H,O (r.d. s 3)NOBr+CHNH->CHN,+H,O+Br(rapid reaction) deduce the rate equation according to this mechanism(3) Pre-equilibrium approximation Azo reaction of aniline under catalysis of HBr. + + Br H +HNO +C H NH C H N +2H O 2 6 5 2 6 5 2 2 − ⎯⎯→ Its mechanism is proposed as: deduce the rate equation according to this mechanism + 2 r k[H ][HNO ][Br ] − = 10.2.1 Approximation treatment of complex reaction mechanism §10.2 Mechanism assumption and Approximate treatment