In an experiment Kinetics and the Hydration of Chickpeas the following data was

Question

In an experiment Kinetics and the Hydration of Chickpeas the following data was collected

1. Indicate the objective of the experiment. 2. Why was the wavelength of 667 nm used to record the disappearance of methylene blue? 3. If rate constant, (k) for this reaction is 0.00614/s, how long would it take for 99% of methylene blue to be consumed? HINT: use the integrated rate law. 4. For the rate order that you determined from your data, what would you expect to happen to the reactions rate, if you doubled the concentration of the methylene blue? Justify your answer. i. Sample preparation data Give a sample calculation for one of the reagents with the proper units and significant figures. ii. Experimental Data 1. Sample calculation: a. Absorbance to concentration (M) of Methylene Blue [MB] b. Natural log (ln [MB]) c. 1/[MB] 2. Graphs ([MB] vs time; ln[MB] vs time and 1/[MB]) a. Graphs should be formatted correctly

Explanation / Answer

1) To check dehydration of chick peas

2) Mthylene blue changes colour at 667 nm

3)

[A] = [A]0 e-k t.

Here k = 0.00614/s

[A] / [A]0 = 99/100

so 99/100 = e^-(0.00614 t)

Take ln on both sidea

ln 0.99   = 0.00614 t

So t = ln 0.99/0.00614 = 161.24 s

4)    no effect on reaction as methylene blue is just indicator and not reactant

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.