镀镍电镀液的分析.doc

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1、电镀液中NiSO4的间接测定法镀镍溶液NiSO4250g/L=250mg/mL,取1mL镀液稀至100mL,CNiSO4.6H2O=2.5mg/mL,取稀释液25mL于50mL烧杯中,加入BaCL2.2H2O溶液(CBaCL2.2H2O=10mg/mL)10mL,生成BaSO4过滤.取滤液5mL测CBa(必要时稀释),求出质量:pBa=CBa测x(25mL+10mL)(测定中高标和低标中换算成Ba浓度的标准)高标0.2g=100mL,即称0.3557g的BaCL2.2H2O定容100mL容量瓶,再从里边取10mL定容100mL容量瓶即为低标.与

2、(SO4)2-生成沉淀消耗的Ba质量QBaBa消耗量(QBa)=Ba总含量－Ba测出量(pBa)QBa=10mg/mLxBa/BaCL2.2H2Ox10mL－pBa=10mg/mLx0.5622x10mL－CBa(测)x35mL=56.22－22.52=33.7mg其摩尔数为33.7mg÷1000÷137.33=0.000245这也是与NiSO4.6H2O生成沉淀的NiSO4.6H2O摩尔数.25mL稀释镀液中NiSO4.6H2O的质量pNiSO4.6H2O为pNiSO4.6H2O=0.000245x262.7=0.0644g/25mLCNiS

3、O4.6H2O=0.0644g/25mL=0.00257g/mL=2.57g/L原液浓度(因稀释100倍)=257g/L