一、选择 1.某一元弱酸溶液中,未电离的弱酸分子与电离生成的阴阳离子物质的量之和的比值为4.5∶1,则此酸的电离度是 A.10% B.11.11% C.22.22% D.20% E.18.18% 2.1 升醋酸溶液稀释至2升,发生的变化是 A.电离度增大 B.[H~+]/[CH_3COOH]增大 C.[H~+]增大 D.[H~+]/[CH_3COOH]减小 3.在U形管中,电解饱和食盐水溶液,两端各滴入紫色石蕊试液,以铂为电极,长时间通电后,阴阳两极溶液的颜色分别是 1. Select 1. The ratio of the sum of the un-ionized weak acid molecules to the sum of the ionized anion and cation species in a weak acid solution is 4.5:1, then the acidity is A.10% B.11.11% C. .22.22% D.20% E.18.18% 2.1 liter acetic acid solution diluted to 2 liters, the change occurred is A. ionization degree increase B.[H~+]/[CH_3COOH] increase C.[H~+] Increase D.[H~+]/[CH_3COOH]decrease 3. In the U-shaped tube, electrolysis saturated saline solution, purple litmus test solution at both ends of each drop, platinum electrode, long-term power, yin and yang The color of the bipolar solution is