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2、 金属离子的副反应系数  M

2、 金属离子的副反应系数  M.  M(L) =1+  1 [L] +  2 [L] 2 +…+  n [L] n. M + Y = MY. OH -. L. MOH. ML. ● ● ●. ● ● ●. M(OH) n. ML n.  M.  M(OH) =1 +  1 [OH - ]+  2 [OH - ] 2 + …+  n [OH - ] n. 多种络合剂共存.  M =  M(L1) +  M(L2) +…+  M(Ln) -( n -1).

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2、 金属离子的副反应系数  M

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  1. 2、 金属离子的副反应系数 M M(L) =1+1[L] +2[L]2+…+n[L]n M + Y = MY OH- L MOH ML ● ● ● ● ● ● M(OH)n MLn M M(OH) =1 +1[OH-]+ 2[OH-]2+ …+ n[OH-]n

  2. 多种络合剂共存 M = M(L1)+ M(L2) +…+M(Ln)-(n-1) M(L) =1+1[L] +2[L]2+…+n[L]n

  3. 3 、络合物的副反应系数 MY M + Y = MY H+ OH- MHY MOHY MY 酸性较强 MY(H)= 1+ KMHY×[H+] 碱性较强 MY(OH)= 1+ KM(OH)Y×[OH-]

  4. 计算：pH=3.0、5.0时的lg ZnY(H),KZnHY=103.0 pH=3.0, αZnY(H)=1+10-3.0+3.0=2 , lgαZnY(H)= 0.3 pH=5.0, αZnY(H)=1+10-5.0+3.0=1, lgαZnY(H)= 0

  5. 二、络合物的条件稳定常数 条件稳定常数：

  6. 例：计算pH = 11, [NH3] = 0.10 时的 lgK’ZnY 解 Zn(NH3)42+的lg 1~lg4分别为2.27, 4.61, 7.01, 9.06 查表12：p.396, 查表10：p.394,

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