REACTION OF CRYSTAL VIOLET WITH NaOH: A KINETIC STUDY Questions/Problems The for

Question

REACTION OF CRYSTAL VIOLET WITH NaOH: A KINETIC STUDY Questions/Problems The formula of crystal violet is C2sHs0N Cl (Fig. 1). Write a balanced molecular equation, using this formula, for the reaction of crystal violet with NaOH. Them write the balanced net ionic equation. 1. 2. The structure of the crystal violet cation is shown in figure 1. Which atom in this structure has a 1+ formal charge? 3. Assume that the reaction is first order in crystal violet and that, for a particular NaOH concentration, k' equals 0.038 min. Use class notes or equation 4 to calculate how many minutes it takes for half of the crystal violet to react. This is the half-life of the reaction.

Explanation / Answer

1. Balanced equation,

[(CH3)2NC6H5]3C+ + OH- ---> [(CH3)2NC6H5]COH

2. The carbon in the structure to which three Ph moieties are attached bear the +ve charge

3. t1/2 = 0.693/k = 0.693/0.038 = 18.24 min

So it would take 18.24 min for half od crystal violet to react.

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