游客
题文

一定温度下的难溶电解质AmBn在水溶液中达到溶解平衡时。已知下表数据

物质
Fe(OH)2
Cu(OH)2
Fe(OH)3
Ksp/25℃
8.0×10-16
2.2×10-20
4.0×10-38
完全沉淀时的PH值范围
≥9.6
≥6.4
3~4

对含等物质的量CuSO4、FeSO4、Fe2(SO4)3的混合溶液的说法,不科学的是
A.向该混合溶液中逐滴加入NaOH溶液,最先看到红褐色沉淀
B.该溶液中c(SO42-):{c(Cu2+)+c(Fe2+)+c(Fe3+)}>5:4
C.向该溶液中加入适量氯水,并调节pH值到3~4后过滤,得到纯净的CuSO4溶液
D.向该溶液中加少量铁粉即能观察到红色固体析出

科目 化学   题型 选择题   难度 未知
登录免费查看答案和解析
相关试题

The CDs are on sale! Buy one and you get ______ completely free.

A.other B.others C.one D.ones ks

I’m sure that your letter will get______ attention. They know you’re waiting for the reply.

A.continued B.immediate C.careful D.general

All the dishes in this menu, ______ otherwise stated, will serve two to three people.

A.as B.if C.though D.unless

The children loved their day trip, and they enjoyed the horse ride ______.

A.most B.more C.less D.little

Progress______ so far very good and we are sure that the work will be finished on time.

A.was B.had been C.has been D.will be

Copyright ©2020-2025 优题课 youtike.com 版权所有

粤ICP备20024846号