What is the product of this reaction? Will[Pb(OH4)]2+ complex precipitate form?
As the NH3 is slightly alkaline, it dissolve in water to give out little hydroxide ion which can form white precipitate with lead hydroxide. However, it never happens,WHY???I think it has nothing to do with the solubility of NH3,hasn't it?
Pb(OH)2(aq)+NH3(aq)
2013-03-02 4:36 am
回答 (4)
2013-03-13 8:22 am
✔ 最佳答案
The solubility of NH3 is very high, so it has nothing to do with solubility,The reason is that NH3 is a weak alkaline.
NH3 + H2O <--> NH4+ + OH- is reversible
And, Pb(OH)2 2- + 2OH- <--> Pb(OH)4- is also reversible
Therefore, there is never a high concentration of OH- such that the white precipitate redissolve to an extent that is observable.
2013-03-07 2:20 am
Zinc hydroxide is insoluble in water too,but it forms a colorless solution with excess NaOH and excess NH3
__________
It is because Lead(II) hydroxide do not form a complex salt with NH3
__________
It is because Lead(II) hydroxide do not form a complex salt with NH3
2013-03-03 12:20 am
Pb 2+ +2OH- --> Pb(OH)2
Pb(OH)2 +2OH- --> Pb(OH)4 2-
-----------------------------------------------
Lead compound will react with ammonia solution to form white precipitate,
but if excess ammonia solution is used, lead hydroxide will ressolve to form
Pb(OH)4 2-
Pb(OH)2 +2OH- --> Pb(OH)4 2-
-----------------------------------------------
Lead compound will react with ammonia solution to form white precipitate,
but if excess ammonia solution is used, lead hydroxide will ressolve to form
Pb(OH)4 2-
2013-03-02 6:18 am
Lead(II) hydroxide is insoluble in water.
收錄日期: 2021-04-13 19:19:19
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20130301000051KK00273