判断题
有关分步沉淀中,溶度积小者一定先沉淀出来。
- 对
- 错
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有关分步沉淀中,溶度积小者一定先沉淀出来。
氯化物的测定常采用莫尔法,以重铬酸钾为指示剂,用硝酸银标准溶液滴定氯离子。
When decorating the house, you can use low-quality paints because they are cheap.
It is good for your health to keep windows and doors open for at least 15 hours a day.
Placing green plants inside is a good way to make your house greener.
You can keep wastes inside for many days if they are untouched.
Flies and mosquitoes are carriers of bacteria and viruses.
直接与金属离子配位的EDTA型体为( )
H6Y2+
H4Y
H2Y2-
Y4-
一般情况下,EDTA与金属离子形成的络合物的络合比是( )
1:1
2:1
3:1
6:1
铝盐药物的测定常用配位滴定法。加入过量EDTA,加热煮沸片刻后,再用标准锌溶液滴定。该滴定方式是( )。
返滴定法
直接滴定法
置换滴定法
间接滴定法