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7. 过氧化氢分解速率常数和活化能的测定

7. 过氧化氢分解速率常数和活化能的测定. 一、实验目的:. 1. 用化学分析方法测定过氧化氢的分解速率; 2. 求出过氧化氢的分解反应速率常数和活化能。. 二、实验仪器. 恒温水浴锅;秒表;滴定管;移液管;锥形瓶. 三、实验原理:. H 2 O 2 分解反应: H 2 O 2 =H 2 O+1/2O 2 ( 一级反应 ). 速度方程:. 积分得 :lnc= -kt+lnc 0 …………………………………………①. 氧化还原滴定: 2MnO 4 - +5H 2 O 2 +6H + =2Mn 2+ +8H 2 O+5O 2 ( 确定浓度 c)

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7. 过氧化氢分解速率常数和活化能的测定

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  1. 7.过氧化氢分解速率常数和活化能的测定

  2. 一、实验目的: • 1.用化学分析方法测定过氧化氢的分解速率; • 2.求出过氧化氢的分解反应速率常数和活化能。

  3. 二、实验仪器 恒温水浴锅;秒表;滴定管;移液管;锥形瓶

  4. 三、实验原理: H2O2分解反应:H2O2=H2O+1/2O2 (一级反应) 速度方程: 积分得:lnc= -kt+lnc0 …………………………………………① 氧化还原滴定:2MnO4-+5H2O2+6H+=2Mn2++8H2O+5O2(确定浓度c) 等物质的量关系:n(2KMnO4)=n(5H2O2), 根据实验方法,式中c(KMnO4)、V(H2O2)为定值 ∴ c(H2O2)与V(KMnO4)呈正比,根据①式ln V(KMnO4)与t呈正比 …………………………… ② 阿仑尼乌斯公式: lnk~1/T呈线性关系:直线斜率为-Ea/R

  5. 四、实验步骤:

  6. 五、数据记录与处理 1.建立lnV(KMnO4)~t回归方程,求k

  7. 2.建立lnk~1/T回归方程,求Ea

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