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1、4.The effect of complex formation on solubility coordination dissolution of precipitation(aq)Cl(aq)Ag(NH (aq)2NHAgCl(s)233-+(aq)AgI (aq)IAgI(s)2-+When the solubility product of the poorly soluble compound is not extremely small,but the formation constant of the complex is relatively large,it is bene
2、ficial to the occurrence of the coordination dissolution reaction.3103.00-=7101067.1108.1-=1123oL2.0molL0.20)mol1.8(O)HNH(-=+=c8.1=xExample:At room temperature,AgCl solid is dissolved in 1 L NH4OH at 0.1 mol L-1,the minimum concentration of NH4OH should be?(aq)Cl(aq)Ag(NH (aq)2NHAgCl(s)233-+Solve:32
3、103.0010.010.0-=Kx23fsp)Ag(NH()AgCl(+=KKKEq.con./(mol/L)Oxidation coordination dissolution：223)l(O4H2NO(g)3S(s)aq()3Cu(NO+242O(l)4H3S(s)2NO(g)(aq)HgCl3H+Redox dissolution：36sp102.1)CuS(K=-3)aq(8HNO3CuS(s)+，sp22)S(S(s)SKJJc-HNO353sp104.6HgS)(K=-3(aq)2HNO12HCl(aq)3HgS(s)+sp22242 )S(S(s)S(Hg2+HgCl HgKJ
4、cc-+HClHigh concentration High concentration HNO3)Dissolving methods of insoluble electrolytes：Adding acid,alkali or ammonia salt Redox-oxidation dissolution Coordination dissolution Coordination dissolutionCalculation and application of generated precipitation Based on the Solubility Product Princi
5、ple,when J K sp,the precipitation occurs.Example:Injecting H2S gas into of CdCl2 solution at the concentration of 110-2 molL-11)What is the S2-concentration when CdS precipitates appears?2)When the Cd2+completely precipitated,what is the S2-concentration?Ksp(CdS)=8.01027 When the S2-concentration re
6、ached 810-25 mol L-1,precipitation began to appear.Normally,when the residual concentration of the precipitate formed by ion and precipitate agent is lower than 1 10-5 mol L-1，it could be considered that the ion has been completely precipitated.Solve:When Cd2+1.0105 moldm-3,S2 is 8.010-22 moldm3,obviously,Cd2+has been completely precipitated.