《分析化学》课程教学课件（PPT讲稿，英文）Chapter 3 summarization of Titrimetric analysis

©山本理大写 Analytical Chemistry Chapter 3 summarization of Titrimetric analysis Learning objectives To master the characteristics,classification of titrimetric analyis,the requirements for reactions used in titrimetric analysis; To master the methods to prepare standard solution,the determination and expression of the concentration;

Analytical Chemistry 2025/4/3 1 Chapter 3 summarization of Titrimetric analysis Learning objectives ◆To master the characteristics, classification of titrimetric analyis, the requirements for reactions used in titrimetric analysis; ◆To master the methods to prepare standard solution, the determination and expression of the concentration;

归东置2大写 Analytical Chemistry ◆To understand primary standard and the requirements for preparing the standard solution directly; to know about the difference between the stoichiometric point and the end point,four kinds of titration manner for titrimetric analysis

Analytical Chemistry 2025/4/3 2 ◆To understand primary standard and the requirements for preparing the standard solution directly; ◆ to know about the difference between the stoichiometric point and the end point, four kinds of titration manner for titrimetric analysis

G 归东理子大军 Analytical Chemistry 1.General principles Titrimetric analysis is one of the major divisions of analytical chemistry and the calculations involved are based on the simple stoichiometric relationships of chemical reactions. A titration is based on a chemical reaction that may be represented as: aA+bB→products

Analytical Chemistry 2025/4/3 3 1. General principles Titrimetric analysis is one of the major divisions of analytical chemistry and the calculations involved are based on the simple stoichiometric relationships of chemical reactions. A titration is based on a chemical reaction that may be represented as: aA +bB→products

归东理工大军 Analytical Chemistry Standard solution Standard solution Stoichiometric indicator relationship sample sample

Analytical Chemistry 2025/4/3 4 Standard solution Stoichiometric relationship indicator sample Standard solution sample

山东理王大军 Analytical Chemistry 2.Terms of titrimetric analysis (1)Titrimetry The method to determinate the concentration of a sample by employing volumetric instruments and indicator. (2)Standard solution In titrimetric analysis,a reagent added as a solution of known concentration is referred to as a standard sulution

Analytical Chemistry 2025/4/3 5 2. Terms of titrimetric analysis (1) Titrimetry The method to determinate the concentration of a sample by employing volumetric instruments and indicator. (2) Standard solution In titrimetric analysis, a reagent added as a solution of known concentration is referred to as a standard sulution

归东觅子大图 Analytical Chemistry (3)Stoichiometric piont The point at which the titrant added just completely reacts with the analyte. (4)Titration curve The curve to describe the relationship between the titrant volume and the solution parameter during the process of the titration. (5)Indicator

Analytical Chemistry 2025/4/3 6 (3) Stoichiometric piont The point at which the titrant added just completely reacts with the analyte. (4) Titration curve The curve to describe the relationship between the titrant volume and the solution parameter during the process of the titration. (5) Indicator

山东理工大军 Analytical Chemistry The material used to indicate the end point because of the color change near the stoichiometric point. (6)End point The point at which the color of the indicator changes and the titration is stopped. The point is not necessarily equal to the stoichiometric point

Analytical Chemistry 2025/4/3 7 The material used to indicate the end point because of the color change near the stoichiometric point. (6) End point The point at which the color of the indicator changes and the titration is stopped. The point is not necessarily equal to the stoichiometric point

归东理工大军 Analytical Chemistry (7)Titration error The difference between the end point and the equivalence point. (8)Primary standard A S suitable,definite composition and highly pure material,used to determine the accurate concentration of standard solution. The requirements for a Primary standard:

Analytical Chemistry 2025/4/3 8 (7) Titration error The difference between the end point and the equivalence point. (8) Primary standard A suitable, definite composition and highly pure material, used to determine the accurate concentration of standard solution. The requirements for a Primary standard:

东理工大军 Analytical Chemistry The material should be of known composition and highly pure,99.9%pure,or better; It should undergo a rapid and stoichiometric chemical reaction with the solution being standardized; The material should stay stable indefinitely at room temperature and should withstand drying in an oven without change,it should not absorb water or carbon dioxide from the atomsphere;

Analytical Chemistry 2025/4/3 9 The material should be of known composition and highly pure, 99.9% pure, or better; It should undergo a rapid and stoichiometric chemical reaction with the solution being standardized; The material should stay stable indefinitely at room temperature and should withstand drying in an oven without change, it should not absorb water or carbon dioxide from the atomsphere;

归东置子大图 Analytical Chemistry It should,if possible,have a high equivalent weight (9)standardization The titration procedures of determining the concentration of standard solution with primary standard is called standardization. 3.Requirements of titrimetric analyis for chemical reaction

Analytical Chemistry 2025/4/3 10 (9) standardization It should, if possible, have a high equivalent weight The titration procedures of determining the concentration of standard solution with primary standard is called standardization. 3. Requirements of titrimetric analyis for chemical reaction