The decomposition of bromodichloroacetate BrCl 2 CCO 2 - is an important require

ID: 793347 • Letter: T

Question

The decomposition of bromodichloroacetate BrCl2CCO2 - is an important required step

in water purification. The kinetics of such decomposition has been presented in Chemical

Reviews, November 2001. There are two possible pathways for these reactions, one

unimolecular and the other bimolecular with the help of OH- ions.

Path 1. BrCl2CCO2- + H2O goes to CHCl2Br + HCO3-

With a pseudo-first order rate constant k1=1.6 x 10-6 1/sec

Path 2. BrCl2CCO2- + OH- goes to Cl2OHCCO2- + Br-

With a second order rate constant k2=2.4x10-4 1/(M sec)

d. Write the overall rate law for the disappearance of BrCl2CCO2-

e. What is the ratio of the rates for paths 1 and 2 at pH=7?

f. At what pH would the rate for path 2 be 10% of the rate for path 1?

the ratios of tehe rates for path 1 and 2 = K1/K 2

= 1.6*10^-6/2.4*10^-4

=0.66*10^-2

the overall rate law for the dissapearance of BrCl2CCO2- = K1[BrCl2CCO2-]+K2[BrCl2CCO2-]^2

as the BrCl2CCO2- is dissappearing by two step mechanism so the disappearance depends on both the steps .

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