污水处理过程中投加浓度为5%(重量)左右的FeS04溶液是如何作用从而能够明显改善外排水质指标?
参考答案:
使水中的氰化物与铁反应形成铁氰络合物沉淀下来从而达到除氰的目的。
比较下列溶液的pH (填“>”、“<”、“=”)
(1)25℃、1mol/LFeCl3溶液_____80℃、1mol/LFeCl3溶液;
(2)0.1mol/L(NH4)2CO3溶液______0.1mol/L Na2CO3溶液。
(3)0.1mol/LNH4Cl溶液______0.01mo1/L NH4Cl溶液;
(4)0.1mol/LNa2CO3溶液______0.1mol/L NaHCO3溶液;
A > < < > B > > > > C < > < > D < < > >
What does the man mean [A] He wants to go with there, [B] He is not interested in going with them. [C] He will invite his friends and go with them.