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滴定液的标定 - PowerPoint PPT Presentation


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滴定液的标定. 滴定液的标定. 1 、基准物质标定法 例:用 邻苯二甲酸氢钾 ( KHC 8 H 4 O 4 )标定 NaOH 溶液时,准确称取 0.5105g 基准邻苯二甲酸氢钾,以酚酞作指示剂,终点时消耗 NaOH 滴定液 25.00ml ,求 NaOH 滴定液的浓度?. 基准物质标定法. 解析 滴定反应式为: 故 a=1 , b=1 ,已知 KHC 8 H 4 O 4 的摩尔质量为 204.2g/mol ,根据滴定分析计算公式可得: 答: NaOH 滴定液的浓度为 0.100mol/L 。. 思考. 课堂互动.

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滴定液的标定
  • 1、基准物质标定法
  • 例:用邻苯二甲酸氢钾(KHC8H4O4)标定NaOH溶液时,准确称取0.5105g基准邻苯二甲酸氢钾,以酚酞作指示剂,终点时消耗NaOH滴定液25.00ml,求NaOH滴定液的浓度?
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基准物质标定法

解析

  • 滴定反应式为:
  • 故a=1,b=1,已知KHC8H4O4的摩尔质量为204.2g/mol,根据滴定分析计算公式可得:

答: NaOH滴定液的浓度为0.100mol/L。

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思考

课堂互动

准确称取0.1300g基准Na2CO3,置于250ml锥形瓶中,加50ml水溶解后,加入甲基橙指示剂3滴,用待标定的HCl溶液滴定至橙色停止滴定,消耗HCl滴定液25.00ml,求HCl滴定液的浓度。

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滴定液的标定
  • 2、滴定液比较法
  • 例:准确量取20.00ml HCl溶液,滴加酚酞指示剂,用0.1000mol/L的NaOH滴定液滴定,终点时消耗NaOH溶液22.00ml,求HCl溶液的浓度。
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滴定液的标定

解 析

  • 滴定反应式为:
  • NaOH + HCl = NaCl + H2O
  • 故a=1,b=1,由滴定反应计算公式可得:
  • 答:HCl溶液的浓度为0.1100mol/L。