Z- is a weak base. An aqueous solution of NaZ is prepared by dissol NaZ in sufficient water to yield 1.0 L of solution. The pH of the solu 25.0C. The Kb of Zis OA) 2.1-10-10 OB) 9.9/10- OC) 2.8-10-2 D) 1.2 10-5 OE) 6.9/10-9 ints) 050 M of methylamine. The concen ine is 4.4 104