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4 Preparation and Recognition of Buffer Systems 14. Which of the following is not a buffer system? A solution containing roughly equal concentrations of _____ a.

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1. Given the relation R (1 1) (1 3) (1 4) (2 2) (3 1) (3 4 ...

9. For each of the following collections of subsets of A= {1,2,3,4,5}, determine whether of not the collection is a partition. If it is, list the ordered pairs in the equivalence relation determined by the partition.

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3 Experimental 4,4’-Di-tert-butylbiphenyl (4): A flame-dried reaction tube connected to an HCl gas trap was charged with biphenyl (0.166 g, 1.08 mmol), t-butyl chloride (0.50 mL, 4.5 mmol), dichloromethane (0.50 mL), and a 4 mm2 square of aluminum foil with the aluminum oxide coating scratched. Once