Question

In the reaction HCO2H(aq) +Br2(aq) ----> 2H+(aq)+ 2Br-(aq)+CO2(g) the Rate = k[Br2] ....why isn't the HCO2H(aq)...

In the reaction HCO2H(aq) +Br2(aq) ----> 2H+(aq)+ 2Br-(aq)+CO2(g) the Rate = k[Br2] ....why isn't the HCO2H(aq) included in the brackets here?

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Answer #1

NOTE that not all reactions follow elemntary rate laws

elementary rate law:

- the reaction depends directly to the reactants concnetrations, and to the power of the reactants stoichiometric coefficient

examplke of alementary rate law:

A + 2 B = C + D

RATE = K*[A][B]^2

note that this is only the case for very special reactions

there are many cases in which experimental data will not depend on such concnetrations

in

HCO2H(aq) +Br2(aq) ----> 2H+(aq)+ 2Br-(aq)+CO2(g)

this is an hallogne (Br2) attacking the acid

sicne Br2 is much more electronegative, it will behave as ana cid

HBr --> H+ and Br- in solution

the rate depends on ly on Br- in this case due to the fact that Br2 is the one who attacks

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