What is the order of reaction with respect to crystal violet?
What is the order of reaction with respect to crystal violet?
The first order graph of crystal violet hydroxylation for both trails is a plot of natural logarithm of absorbance over time. The graph is linear with the higest R2 value of 0.99702 and 0.99801 for both trials. Thus, the order of reaction (m) with respect to crystal violet is first.
What is the activation energy of crystal violet and sodium hydroxide?
The activation energy of the reaction was determined as 60.57 kJ/mol. The reaction was an endothermic reaction having enthalpy values of 58.13 and 58.29 kJ/mol at 21 and 6 °C, respectively.
Is crystal violet a first order reaction?
Discoloration ofcrystal violet is first order with respect to the concentration of crystal violet and hydroxyl ion concentration.
Does crystal violet adhere Beer’s law?
Since the hydroxide ion concentration is more than 1000 times as large as the concentration of crystal violet, [OH-] will not change appreciably during this experiment. Absorbance is proportional to the concentration of crystal violet (Beer’s law).
What is the rate law for the crystal violet reaction with respect to concentration of crystal violet?
The rate law for this reaction is in the form: rate = k[CV+]m[OH–]n, where k is the rate constant for the reaction, m is the order with respect to crystal violet (CV+), and n is the order with respect to the hydroxide ion.
What is a pseudo rate law?
A very important case is that of pseudo-first order kinetics. This is when a reaction is 2nd order overall but is first order with respect to two reactants. The initial rate depends on both A and B and as the reaction proceeds both A and B are changing in concentration and affecting the rate.
How do you calculate absorbance rate?
absorbanceThe absorbance is directly proportional to the concentration, so this is simply a plot of the rate law, rate = k[C60O3], and the slope of the line is the rate constant, k.
How do you find rate law from absorbance?
How do you calculate the rate of a crystal violet reaction?
A simplified version of the equation is: The rate law for this reaction is in the form: rate = k [CV +] m [OH –] n, where k is the rate constant for the reaction, m is the order with respect to crystal violet (CV + ), and n is the order with respect to the hydroxide ion.
Why does [Oh –] not change with concentration of crystal violet?
Because the hydroxide ion concentration is more than 1000 times as large as the concentration of crystal violet, [OH –] will not change appreciably during this experiment. Thus, you will find the order with respect to crystal violet ( m ), but not the order with respect to hydroxide ( n ).
How do you measure the absorbance of NaOH and crystal violet?
In this experiment, crystal violet and NaOH form a complex that changes from transparent blue to colorless over time. The absorbance is measured using a spectrophotometer, and the rate law is then determined using this information. First, a spectrophotometer was turned on and set at a wavelength of 595 nm.
What is the rate law for this reaction with the reactant?
(crystal violet) The rate law for this reaction would then be in the form Rate = 4 4 s ] = k [CV+]x[OH-]y However, in order to use graphical analysis to determine reaction orders, pseudo reaction conditions are necessary. In this case, the reactant that will be in excess is the sodium hydroxide. Thus, the rate law can be rewritten as
