6AgNO 3 + 3S + 2NO + 4H 2O AgCl 易溶于 NH 3?H 2O AgBr AgI AgBr 易溶于 Na 2S 2O 3 AgI 易溶于 KCN [) 2] -特别稳定难溶于 NH 3?H 2O ●银镜反应: 2[ Ag(NH 3) 2] + +RCHO + 2OH - = RCOONH 4 + 2Ag + 3NH 3 + H 2O ● Zn 盐 ZnCl 2?H 2 O Zn(OH) Cl + HCl (g) ? Zn 2+ + H 2 O = Zn(OH) + + H + ZnCl 2 + H 2 O = H[ZnCl 2 (OH)] 酸性● Zn 2+的络合物: [ ZnCl 4] 2- , [) 4] 2- , [Zn(H 2 O) 6] 2+ , [Zn(NH 3) 4] 2+ Zn(OH) 2不溶于氨水 Zn(OH) 2? Zn 2+ + 2OH -K° sp = 1.2 ?10 -17 Zn 2+ + 4NH 3? [Zn(NH 3) 4] 2+?° 4 = 5.0 ?10 8 Zn(OH) 2 + 4NH 3? [Zn(NH 3) 4] 2+ + 2OH -K° 3 = K° sp??° 4 = 6.0 ?10 -9 Zn(OH) 2 (s) + 2NaOH(aq) = Na 2 [Zn(OH) 4 ](aq) Zn(OH) 2 (s) + H +( aq ) = Zn 2+ + 2H 2O 两性 FeO + 2H[ZnCl 2 (OH)] = Fe[ZnCl 2 (OH)] 2 +H 2 O 焊药
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