In this experiment, the reaction and data collection are summarized below: CV(aq

Question

In this experiment, the reaction and data collection are summarized below: CV(aq) + OH-(aq) Cv0Haq) Rate = k [CV+] The order of reaction is determined using the initial rate method: Answer the following questions 1. Using the rate law, what factor affects the rate of the reaction? (0.025 pt) Brierfly describe the order of reaction with 2. What is the overall order of reaction? (0.025 pt 3. What is the role of sodium hydroxide in the reaction? (0.025 pt.) 4. Using the concepts you learned from the lab manual, what will happen to the color of crystal violet as the reaction proceed? (0.025 pt. 5. What instrument can measure this color change in order to study the reaction rate in this experiment ? (0.025 pt.) respect to this factor. (0.02

Explanation / Answer

For the reaction of crystal violet (CV) with NaOH,

rate kaw can be written as,

rate = k[CV]

So,

1. According to the rate law, the reaction is affected by the concentration of [CV] in the reaction. The order of the reaction is 1.

2. Overall order of the given reaction is 2, with reactio depending upon the concentration of both [CV] and [OH-], however, [OH-] is made so large, that the change in its concentration over time becomes negligible and therefore the abiove rate law stands correct.

3. sodium hydroxide acts as the base to prepare the carbinol product which is colorless.

4. The color will become less intense as the reaction progresses. Such that more and more crystal violet is consumed over time and eventually when all of the crystal violet is consumed, the solution turns colorless.

5. Colorimeter is used to the change in color and to determine rate of the reaction.

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