[madscientist]

I am currently doing a prac involving the kinetics of inversion of sucrose and am trying to figure out what effect the following would have on the rate constant and rate of reaction:

Sucrose ---- H2O/H3O+----> Fructose + Glucose + H3O (acid catalyst)

the reaction is first order with respect to Sucrose.

(i) Increasing the Sucrose concentration:

Effect on rate of reaction = slower reaction, therefore decreases rate of reaction

Effect on rate constant (k) = No effect, k is concentration independent

(ii) Increasing acid concentration:

Effect on rate of reaction = Faster reaction, therefore increases rate of reaction

Effect on rate constant (k) = No effect, k is concentration independent


(iii) Increasing the temperature at which the reaction takes place:

Effect on rate of reaction = Increases rate of reaction, increases energy of molecules enough to overcome the activation energy barrier.

Effect on rate constant (k) = Im guessing that because the rate constant 'k' is temperature dependent that increasing the temperature is going to also increase the value of the rate constant?

Can anyone please tell me if these answers are correct and whether it is a general rule that as the temperature at which a reaction takes place increases so does the rate constant 'k' (no matter what reaction is taking place)?

Any help appreciated,

Cheers.