文档介绍：重量分析
参考答案
:
加入过量50%的沉淀剂,需的H2SO4的体积为:
:
在纯水中,各种效益都不考虑时,
所以
(2)
只考虑同离子效益时,
所以
补充:若同时考虑盐效应时,由于有存其它副反应。
所以
离子强度为
根据戴维斯公式计算得:
故
(3)
根据戴维斯公式
计算得:
由于仅考虑盐效应,所以
故
(4)
在溶液中,
(或:)
因为只考虑酸效应,所以
故
补充:同时考虑盐效应时
根据戴维斯公式
计算得
(,不切合实际情况,错在哪里?)
故
(5)
当时,
所以
由于仅考虑络合效应,所以
故
: HF的
只存在酸效应,所以
:
在溶液中,
由于浓度较小,所以只考虑同离子效应
(2)溶液液中
由于浓度较小,所以只考虑同离子效应
所以在中溶解度大。
:
的的
的
时,
主要考虑络合效应,所以
故
: 的
或:
时,已知
此时,主要考虑同离子效应和副反应,忽略盐效应
所以
设此时的溶解度为S,则
的
因为,所以忽略第二步水解作用
考虑:
水解常数
仅考虑的酸效应,所以
:(1)
(2)
(3)
22.(1)(3)偏低
偏高
(4)无影响
:
Acknowledgements
My deepest gratitude goes first and foremost to Professor aaa , my supervisor, for her constant encouragement and guidance. She has walked me through all the stages of the writing of this thesis. Without her consistent and illuminating instruction, this thesis could not havereached its present form.
Second, I would like to express my heartfelt gratitude to Professor aaa, who led me into the world of translation. I am also greatly indebted to the professors and teachers at the Department of English: Professor dddd, Professor ssss, who have instructed and helped me a lot in the past two years.
Last my thanks would go to my beloved family for their loving considerations and great confidence in me all through these years. I also owe my sincere gratitude to my