a experiment with Kinetics and the Hydration the following data was collected 1.

Question

a experiment with Kinetics and the Hydration the following data was collected

1. Why was the wavelength of 667 nm used to record the disappearance of methylene blue?

2. 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.

3. 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.

Condition Time (min) mass (g) o C, no salt o°c, 1M(salt) RoomTemp, no salt RoomTemp, 1M 50°C, no salt 0°C, 1M(salt) 1 RoomTemp, no salt 50 C, 1M mass mass mass mass mass 9.1 9.520.0450 9.81 0.0768 10 0 9.52 0.0601 9.56 0.0403 9.68 0.0533 9.860.0729 9.91 0.0783 0.0968 0.1507 0.1958 0.2365 0.2684 0.3025 0.33441 0.382810.50 0.2167 0.4532 9.270.0742 9.58 0.1101 9.81 0.1367 9.940.1518 0.080.1680 10.16 0.1773 10.35 0.1993 9.97 10.46 1 0.0432 0.0670 0.0818 0.1000 0.1170 10.02 0.0903 0.1409 10.15 0.1045 0.1534 10.21 0.1110 0.1739 10.45 0.1371 0.1932 10.58 0.1513 76 0.0869 0.1114 0.1303 0.1492 4 10.15 10.32 10.51 10.10 0.1087 10.26 0.1262 11.24 11.53 0.1383 11.84 0 0.1704 10.37 10.630.1837 10.52 0.1548 10.890.2127 10.83 0.1888 04 10.15 10.33 10.50 10.69 10.91 6 12.13 12.57 13.21 13.73 14.49 8 0.1837 10.89 0.2127 0.1513 11.23 0.2506 0.214810.740.168711.44 0.2739 11.18 0.2272 11.80 10.81 0.2526 11.14 0.2908 1 11.00 0.2075 15 201 0.45321 0.5105 0.5941 11.60 0.3441 10 7410.168 _11.44 0.2739 0.2398 10.960.1926 0.3140 11.60 0.2733

Explanation / Answer

a) Methylene blue is a dye with maximum absorption of light around 670 nm.So wavelength of 667 nm was used.

b) K = 0.00614/s

It is a first order reaction. So r = K[A]

For 1st order reactions, ln [A]t = -kt + ln [A]0

So [A]t = 0.99[A]0

using in above equation ln 0.99 = -0.00614t

t = 1.63 seconds

b) since rate is is of order 1, if we double the concentration rate will be doubled

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