For each compound rank the following amines in order of increasing basicity. : CH3 NEC NH2 A H3C -NH2 C D What is the maximum pH in which either of the following would predominantly exist as a +2 ion?

Consider the following four biological solutions: (1) bile, pH 8.0, (2) blood, pH 7.4, (3) urine, pH 6.0, and (4) gastric juice, pH 1.6. a. Which solution has the lowest [H3O+]? b. Which solution has the lowest [OH]? c. List the solutions in order of decreasing acidity. d. List the solutions in order of increasing basicity.