實驗五 錯化合物滴定法 預報.doc

實驗五 錯化合物滴定法 預報.doc - 實驗五...

This preview shows page 1 - 2 out of 3 pages.

實驗五 錯化合物滴定法 預報 化學 107 C34034067 鄭羽閎 A 1 1 、實驗目的: 學習以 EDTA 錯合滴定法分析自來水硬度及未知之陰、陽離子。 2 、實驗原理: EDTA(ethylenediaminetetraacetic acid) 的鈉鹽可與 +1 價以外之金屬離子結 合形成安定之錯合物。當溶液調整 pH 值在 10 附近,加入 EBT(eriochrome black T) 指示劑時, Ca 2+ Mg 2+ 離子與指示劑結合形成紅色離子,以 EDTA 準液滴定至滴定終點時,溶液呈藍色。 1. 在含 M 2+ 水溶液中,加入指示劑 (pH=10) M 2+ +HIn 2- →H + +MIn - ( 紅色 ) 2. EDTA 滴定時 HY 3- +M 2+ →[M-HY] - (complex ;無色 ) 3. 達當量點時 HY 3- +MIn - →MY 2- +HIn 2- ( 藍色 ) EDTA 除了分析金屬陽離子外,也可以用來間接分析陰離子;先利用金屬陽 離子與待測陰離子沉澱後,再以 EDTA 來分析過量的金屬陽離子,進而定 量該陰離子的濃度。 3 、試劑: C 10 H 14 N 2 Na 2 O 8 2H 2 O(s) MgO(s) EBT 指示劑 6N HCl NH 4
Image of page 1

Subscribe to view the full document.

Image of page 2
  • Fall '14

{[ snackBarMessage ]}

Get FREE access by uploading your study materials

Upload your study materials now and get free access to over 25 million documents.

Upload now for FREE access Or pay now for instant access
Christopher Reinemann
"Before using Course Hero my grade was at 78%. By the end of the semester my grade was at 90%. I could not have done it without all the class material I found."
— Christopher R., University of Rhode Island '15, Course Hero Intern

Ask a question for free

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern