高中化学知识总结离子存问题小结(Summary of chemistry knowledge in .docxVIP

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 ) Summary of chemistry knowledge in Senior High School: summary of ion coexistence 1. Colorless transparent conditional type If the title is limited, is not colorless solution containing nonferrous ions, namely Fe2+ (light green), Fe3+ (yellow), Cu2+ (blue), MnO4 (purple) plasma. If transparent, the solution does not form cloudy or precipitate (irrespective of the color of the solution). 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. Example 1. in a colorless transparent solution, the following groups of ions can coexist in large numbers 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 two conditions: colorless, transparent and able to coexist in large quantities. The answer is C. Two. Acid condition type 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 -, and acid radical ions (such as HCO3 -, HSO3 -, HS -, HPO42 -, H2PO4 -, etc) of weak acids. Example 2.. In a pH=1 solution, a large number of ions can coexist A.K+, Na+, SO42 -, SO32 B.NH4+, Mg2+, SO42 -, Cl - C.Na+, K+, HCO3, Cl D.K+, Na+, AlO2 and transport are No3 Analysis: the corre