10.8 Kinetics of reactions in solution (3)Kinetics treatment For diffusion control Fickian first law Flux DA d diffusion coefficient with unit of m2.s-1 For second-order reaction r=-4TARD dn B Integration yields r=4T(TA +BDBNBFor diffusion control Fickian first law B B dn dc DA dt dx Flux  = = − D diffusion coefficient with unit of m2 s -1 . For second-order reaction 2 AB 4 B B dN r r D dx = −  Integration yields A B B B r r r D N = + 4 ( )  (3) Kinetics treatment 10.8 Kinetics of reactions in solution