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Unformatted text preview: 5. Measure the absorbance of each sample at 660 nm using a spectrophotometer. Part B: 1. Obtain 25 mL samples of 10-4 M Methylene Blue solution in 7 Petri dishes. 2. Add 25 mg of TiO 2 to all Petri dishes and cover immediately and seal with tape. 3. Place all samples in sun light. 4. Immediately withdraw 1 sample and repeat steps 4 and 5 in Part A then, withdraw the remaining samples in 10 minute intervals....
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- Fall '08