In this experiment the oxidation of ethanol to produce ethanal by potassium dich

Question

In this experiment the oxidation of ethanol to produce ethanal by potassium dichromate is studied. The rate of the reaction is measured using a spectrophotometer by the following rate of a disappearance of the chromic acid as a function of time.

3CH3CH2OH (aq) + H2CrO4 (aq) 3CH3COH (aq) + Cr3+ (aq) + 4H2O (l)

*Write the integrated rate law for the reaction that is zero order with respect to H2CrO4. What would you plot and how would you determine if the reaction is zero order with respect to H2CrO4?*

Explanation / Answer

Integrated rate law for reaction that is zero order with respect to H2CrO4 is :

[H2CrO4]o - [H2CrO4]t =kt

If you plot [H2CrO4] with time , a straight line graph will be obtained with slope = -k

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