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Unformatted text preview: 学计量点不一致所引起的误差 0 0 cTVep − c DVo TE = 0 c DV0 Vep + V0,由于 c 0V0 = c ep (V0 + Vep ) 分子、分母均除以 TE = cT ,ep − c D ,ep c D ,ep 因为 cT ,ep − c D ,ep = [T ]ep − [ D ]ep ,则 [T ]ep − [ D ]ep TE = 计算误差的出发点 c D ,ep 与 pT , pD 联系起来作变换 [T ] eq = [ D ] eq 10 − pTeq TE = = = 10 10 − pD eq − pTep − 10 − pD ep c D ,ep [ D ] eq (10 − ∆pT 10 − pTep = − 10 − ∆pD ) c D ,ep ∆pT = pTep − pTeq ∆pD = pDep − pDeq [ D ] eq 10 − pTeq − 10 c D ,ep − pDep [ D ] eq 10 − pD eq 还需找出指示量 ∆pT 与 ∆pD 的关系 沉淀 Ksp = [T][D] pK sp = pT + pD ∆pT = −∆pD TE = 络合 TE [ D]eq (10 K TD = − ∆pT − 10 ∆pT ) c D ,ep [TD]ep [T ]ep [ D ]ep 0,终点与计量点极接近: [TD]ep = [TD]eq = c D ,eq ∆pT = −∆pD TE = [ D ]eq (10 ∆pD − 10 − ∆pD ) cD ,ep 当滴定误差不大时, cD,ep ≈ cD,eq 则有 沉淀滴定 TE = [D]eq (10 − ∆pT − 10 ∆pT ) cD,eq = K sp (10 − ∆pT − 10 ∆pT ) cD,eq 络合滴定 TE = [D]eq (10∆pD − 10 − ∆pD ) cD,eq 上式称为林邦误差公式 10∆pD − 10 − ∆pD = cD,eq ⋅ β − ex − e x 为运算方便,由双曲正弦函数 sinh( x ) = 作进一步变换: 2 用 ∆pI 代替 ∆pT 或 ∆pD : ∆pI 代表 ∆pT 取负, ∆pI 代表 ∆pD 取正。 2[ D ] eq sinh( 2.303∆pI ) TE = ± c D,eq 用计算器依次按 x hy...
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This note was uploaded on 08/18/2012 for the course CHE 322 taught by Professor Liuyu during the Spring '12 term at Nanjing University.

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