题目

FeCl3具有净水作用，而高铁酸钠(Na2FeO4)易溶于水，是一种新型多功能水处理剂，处理污水比FeCl3高效。请回答下列问题： Kh=2.5×10-5(1)FeCl3净水的原理是___________。(用离子方程式表示)，Fe3+水解生成的Fe(OH)3胶体粒子能吸附水中的悬浮杂质，向Fe(OH)3胶体中滴加盐酸，现象为___________。 (2)25℃时pH=3的溶液中，Fe3+浓度的最大值为c(Fe3+)=___________mol•L-1.(3)FeCl3在溶液中分三步水解： Fe3++H2OFe(OH)2++H+ K1 Fe(OH)2++H2O +H+ K2 +H2OFe(OH)3+H+ K3以上水解反应的平衡常数K1、K2、K3由 My name is Frank White. I’m fifteen years old. I was born(出生) on May 13th, 1996. Mike is my good friend. His birthday is on May 15th. He is only 13 years old now. Every year on May 14th, we have a birthday party together in our school. We often have a pop concert（音乐会） . I play the guitar. He plays the drum. Many friends come to our party. We are very happy.【1】Frank’s birthday is on __________.A. May13th B. May14 th.C. May 15 th . D. May 16 th.【2】Mike was born on ______________.A. May 13 th, 1998. B. May 15 th , 1998.C. May 14 th,1996. D. May 16 th , 1996.【3】_______________ on May 14 th.A. Frank’s birthday isB. Mike’s birthdayC. They have a basketball game.D. They have a birthday party.【4】Mike is ______________ years old.A. 13 B. 14 C. 15 D. 16【5】What does Frank play on the concert?A. The drum B. The guitarC. Games D. We don’t know.