Homework answers / question archive / Expt: K-302 Rate Law Determination of Crystal Violet Reaction Post lab Questions: 1) Is the reaction of crystal violet with sodium hydroxide zero order, first order, or second order with respect to crystal violet? Explain your answer with reference to your printed graphs

Expt: K-302 Rate Law Determination of Crystal Violet Reaction Post lab Questions: 1) Is the reaction of crystal violet with sodium hydroxide zero order, first order, or second order with respect to crystal violet? Explain your answer with reference to your printed graphs

Sociology

Share With

Expt: K-302 Rate Law Determination of Crystal Violet Reaction Post lab Questions: 1) Is the reaction of crystal violet with sodium hydroxide zero order, first order, or second order with respect to crystal violet? Explain your answer with reference to your printed graphs. 2) Determine the value of the rate constant k’ from the slope of the appropriate plot. Make sure you include units. 3) The rate constant, k’, obtained from the slope of the appropriate plot (Q2), is called k’ because of the conditions of the reaction that you performed where the concentration of hydroxide is so large that it essentially remains constant (see Introduction section). We know that: Rate = k [CV+]m [OH-]n where [CV+] is the initial concentration of crystal violet, and [OH-] is the initial molar concentration of hydroxide ions And under the conditions of your experiment Rate = k’ [CV+]m where k’ = k [OH-]n In Question 2 you have therefore determined the value of m (the reaction order for crystal violet) and k’ If you knew that the reaction is first order with respect to hydroxide ion, (n = 1) and that the initial concentration of hydroxide ion in the reaction you performed is 0.010 M, calculate the value of k. Remember to include units. 4) Based on your answers for Question 2 and Question 3, write the complete rate law expression for the reaction of crystal violet and hydroxide ion. For your statement, assume that the reaction was carried out at room temperature (approx. 25 deg. C) 5) Based on your value of k from Question 3, determine the half-life of the reaction in seconds. 0.5 0.4 Absorbance Linear Fit for: Latest | Absorbance Abs = mt+b m (Slope): -0.02054 b (Y-Intercept): 0.4697 Correlation: -0.9760 RMSE: 0.02834 0.3 0.2 0.1 5 10 Time (min) 15 20 -1.0 Linear Fit for: Latest | Ln Absorbance Ln Abs = mt+b m (Slope): -0.08908 Ln Absorbance b (Y-Intercept): -0.5652 Correlation: -0.9999 RMSE: 0.007743 -1.5 -2.0 -2.5 5 10 Time (min) 15 20 12 10 1/Absorbance Linear Fit for: Latest | 1/Absorbance 1/Abs = mt+b m (Slope): 0.4538 8 b (Y-Intercept): 0.3698 Correlation: 0.9732 RMSE: 0.6631 6 4 2 5 10 Time (min) 15 20