Please help on this! RATE DETERMINATION of the CRYSTAL REACTION PURPOSE To stud

Question

Please help on this! RATE DETERMINATION of the CRYSTAL REACTION PURPOSE To stud the reaction rate crystal violet with Naot usin To determine the reaction order with respect to each of the reactants To calculate the room temperature rate constant for the reaction. In this experiment, you will observe the reaction between crystal violet and sodium hydroxid equation for the reaction is shown here: A simplified (and less intimidating!) version of the equation is: OH CVOH. (crystal violet) (ydroxide) The rate law for this reaction is in the nate-kICv the rate constant form: LoH n, where k is the m is the with respect to and nis order with respect to the hydroxide ion, the ion concentration is more than 1000 times as large as the concentration of crystal violet, [OH-1 will not change appreciably during 1 of experiment. Thus the data collected from part 1 of the experiment will allow you to find the order respect er violet (m), but not the order with respect to hydroxide (n). For this calculation [OH jn can be treated as a constant so the equation becomes: rate k ICV Where k' is a pseudo rate constant. As the reaction proceeds, a violet-colored reactant will be slowly changing to a color product. Using a spectrometer, you will measure the absorbance of the crystal violet solution with time You will determine the appropriate wavelength based on the absorbance spectrum of the solution. Crystal violet solutions obey Beer s law. Thus, the relationship between the observed absorbance and the [CV] is given by: A Ebc. Where epsilon, E is the molar absorptivity, 50 x 10 M cm b is the cell path length (.00 cm); and c is the CV molar concentration.

Explanation / Answer

From the above data set

The plot is shown above

this is a first-order plot

The reaction is first order in kinetics with respect to [CV]

rate constant k

= -slope

= -(-0.0014)

= 0.0014 s-1

The reaction is zero order with respect to [OH-]

the rate law would be thus,

rate = k[CV]

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