高中化学知识总结离子共存问题小结（Summary of chemistry knowledge in Senior High School summary of ion coexistence）.doc

高中化学知识总结离子共存问题小结（Summary of chemistry knowledge in Senior High School summary of ion coexistence） High school chemistry knowledge summary: ion coexistence problem summary A transparent condition. If the title is limited, is not colorless solution containing nonferrous ions, namely Fe2+ (light green), Fe3+ (yellow), Cu2+ (blue), MnO4 (purple) plasma. If the transparent, the solution does not form turbidity or precipitation (solution and there is no color independent). Such as Ag+ and Cl -, br, I, Ca2+, SO42 - and SO42 -; CO32; Ba2+ and CO32, SO32, etc. the reaction of SO42 - in aqueous solution, precipitation to produce turbid or obvious, they cannot coexist a lot. A colorless and transparent solution of 1. cases, the following groups can coexist is a large number of ions A.H+, Cl -, Ba2+, CO32 B.Ag+, I, K+, transport are No3 C.K+, oh -, Cl -, Na+ D.Fe3+, Cl -, transport are No3, Na+ The correct option should meet and a large number of colorless and transparent coexistence of two conditions. The answer is C. Two. The acid condition A common description of strong acidic solution, PH=1 solution, PH can make the litmus red solution, purple litmus solution red solution, methyl orange red solution, adding magnesium powder can release hydrogen solution. If the title is defined in acidic solution, the solution in the presence of H+, which does not contain large amounts of OH - ions and weak acid (such as CO32, SO32, S2, F, ClO, CH3COO, PO43, AlO2, SiO32 etc.) and weak acid ions (such as HCO3, HSO3, HS, HPO42, H2PO4 etc.). 2. cases in the solution of pH=1, can be a large number of coexisting ions are A.K+, Na+, SO42 -, SO32 B.NH4+, Mg2+, SO42 -, Cl - C.Na+, K+, HCO3, Cl D.K+, Na+, AlO2 and transport are No3 The correct option should satisfy the pH=1 (a large number of H+) and can be a lot of coexistence of two conditions. The answer is B. Three. The basic condition A common description of strong alkaline solution, PH=14 solution, PH can make the litmus blue solution, red lit