1 / 7

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)

Download Presentation

7. 过氧化氢分解速率常数和活化能的测定

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  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

More Related