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# 7. 过氧化氢分解速率常数和活化能的测定 - PowerPoint PPT Presentation

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

• 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。

H2O2分解反应：H2O2=H2O+1/2O2 (一级反应)

∴ c(H2O2)与V(KMnO4)呈正比，根据①式ln V(KMnO4)与t呈正比

…………………………… ②

lnk~1/T呈线性关系：直线斜率为-Ea/R

1.建立lnV(KMnO4)~t回归方程，求k

2.建立lnk~1/T回归方程，求Ea