echemi logo
Product
  • Product
  • Supplier
  • Inquiry
    Home > Chemicals Industry > Chemical Technology > Titration Analysis Method-Coordination Titration Method (1)

    Titration Analysis Method-Coordination Titration Method (1)

    • Last Update: 2021-09-22
    • Source: Internet
    • Author: User
    Search more information of high quality chemicals, good prices and reliable suppliers, visit www.echemi.com

    1 Overview

    Coordination titration is a method of titration analysis using coordination reaction


    Coordination reaction is a reaction in which a central ion or atom and a ligand form a coordination bond (coordination ion)


    According to the different number of coordinating atoms contained in the ligands, it can be divided into single-base ligands and multi-base ligands, which form simple complexes and chelate complexes with metal ions, respectively


    A simple complex refers to a compound formed by direct coordination between a single-base ligand and a central atom


    A stable complex formed by a central atom and a multidentate ligand that has a ring structure and clamps the central ion with a double chelate is called an integrant


    2.


    (1) EDTA and disodium EDTA


    When H 4 Y is dissolved in an aqueous solution with high acidity, its two carboxylates can accept H + , so EDTA is equivalent to a hexabasic acid, namely H 6 Y 2+


    (2) The stability of EDTA integrants


    (3) The acid effect of EDTA


    Suppose the total concentration of EDTA is C Y =[Y'], then


    The acid effect coefficient is only a function of [H], and has nothing to do with the concentration of the complexing agent.


    (4) The lowest pH value and acid effect curve


    The calculated minimum pH value required for titration of various ions with EDTA is the ordinate, and lgKMY is the abscissa, and then the acid effect curve is drawn, as shown in Figure 2.


    Related Links: Titration Analysis-Precipitation Titration

     

     

    This article is an English version of an article which is originally in the Chinese language on echemi.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to service@echemi.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

    Contact Us

    The source of this page with content of products and services is from Internet, which doesn't represent ECHEMI's opinion. If you have any queries, please write to service@echemi.com. It will be replied within 5 days.

    Moreover, if you find any instances of plagiarism from the page, please send email to service@echemi.com with relevant evidence.