| 摘要: |
| 分别测定在有超声波作用和在无超声波作用条件下,酸化碘酸钾(KIO3)和亚硫酸钠(Na2SO3)反应的反应速率方程式及活化能,从而研究该反应的机理以及超声波在该反应中的作用,并确定反应的最佳条件。实验得出,超声波对该反应有一定的促进作用,但是这种促进作用只提高反应的速率常数和降低反应的活化能,并没有改变反应机理。在超声波功率为300W时,反应的速率方程表示式为:v=k·c1.09(KIO3)·c1.00(Na2SO3)·c1.08(H+),其中:k=950(mol-1·L)2·s-1,活化能为1735kJ·mol-1。实验还得出,在温度为298K时,当KIO3与Na2SO3的初始浓度比为2:5,H+的初始浓度为0.0428mol·L-1,超声功率为300W时,反应速率为最快,即v=4.31×10-4mol·L-1·s-1)。 |
| 关键词: 碘酸钾 亚硫酸钠 超声波 酸化 反应速率 |
| DOI： |
| 投稿时间：2004-03-25 |
| 基金项目:广东省教育厅项目(Z03065)和韩山师院重点项目。 |
|
| Study on Reaction Rate in Chemical Reaction of Acidic KIO3 and Na2SO3 under Ultrasonic Field |
|
Lin Manbin, Lu Minyi
|
| (Chemistry Dept., Hanshan Teachers College, Chaozhou, Guangdong, 521041, China) |
| Abstract: |
| We present the stimulative function of ultrasound in the reaction of acidification KIO3 and Na2SO3.It is found that there are some stimulative functions to that reaction when using ultrasond,this function just improves the reaction rate constant and reduces the activation energy without changing the mechanism of reaction.When the ultrasonic power is 300W,the rate equation is:v=k·c1.09(KIO3)·c1.00(Na2SO3)·c1.08(H+),k=950(mol-1·L)2·s-1,activation energy is 17.35kJ·mol-1.It's also found that the reaction rate is the fastest (v=4.31×10-4mol·L-1·s-1) at 298 K when the proportion of KIO3 and Na2SO3 on the conversion ratio is 2:5,H+ conversion ratio is 0.0428 mol·L-1,and the ultrasonic power is 100%(300W in this experiment). |
| Key words: KIO3 Na2SO3 ultrasound acidification reaction rate |
