题目

 (1)室温下pH＝9的NaOH溶液和pH＝9的CH3COONa溶液中，设由水电离产生的OH－的物质的量浓度分别为A和B，则A和B的关系为________。 (2)在纯碱溶液中滴入酚酞，溶液变红色，若在该溶液中再滴入过量的BaCl2溶液，所观察到的现象是产生白色沉淀，且红色褪去，其原因是___________________________。 (3)若AmBn的溶液为弱酸强碱盐的溶液，则其水解的离子方程式是_________________。 My name is Nick.. I have four new good friends. They are Dick, Helen, Jack and Amy. Now, they’re in the garden. Dick and Jack are boys. Dick is tall and strong. Jack is tall but he’s not strong. He is thin. Helen and Amy are girls. They’re twins. They are short and slim. Dick is thirteen. Helen is thirteen too. They’re in the same class. Jack is in Class4. His shoes are black and his T-shirt is white.1.Where are Dick and Helen now?A. In the library. B. At home. C. In the classroom. D. In the garden.2.Who is tall and thin?A.Helen B.Dick C.Jack D.Nick3.What is Amy like?A.Short and slim B.tall and slim C.fat and short D.fat and strong4.What colour is Jack’s T-shirt?A.Black B.Red C.White D.Brown5.Who are thirteen years old?A.Dick and Helen B.Nick and Jack C.Simon, Helen and Jack D.Jack and Amy