Non-aqueous titration and complexometric Titration.pptx

Non-aqueous titration and complexometric Titration.pptx

1. Non- aqueous titration and complexometric Titration

2. Introduction: Non-aqueous titration is the titration in which titration of "week acidic or week basic substance" is carried out using" non aqueous substance" to get end point. Weak acid: Weak acid is an acid that is "partially dissociated" into its ions in an aqeous solution or water,e.g-hydroflouric acid(HF). Weak base: Weak base is a base that is partially dissociated in an aqueous solution, e.g -NH₄OH

3. Principle: The reaction that occurs during non-aqueous titration can be explained by means of the concept of Bronsted -Lowry theory. According to this theory, an acid is a substance which will tend to donate a proton and abase is any substance, which will accept a proton. When an acid HB dissociates it yields a proton together with the conjugate base B of the acid, HB ⇌ B + + F - Alternatively, the base B will combine with a proton to yield the conjugate acid HB.

4. Need of non- aqeous Titration: To titrate week acid or week bases. To get sharp end point. To determine the substances which are insoluble in water. Non-aqueous Solvents: Solvents which are used in non-aqueous titration are called non-aqueous solvents.

5. Types: They are following types:- 1. Aprotic Solvent 2. Protogenic Solvent 3. Protophillic Solvent 4. Amphiprotic Solvent

6. 1. Aprotic Solvents/Inert solvents: Aprotic solvent are most important solvent in this titration. These solvents are chemically inert and they work as a catalyst. The most important examples of aprotic solvents are; Chloroform, Benzene, Carbon tetra chloride etc

7. 2. Protogenic Solvents: Protogenic solvents are acidic in nature and they can donate the proton and enhance the strength of weak bases. Examples of Protogenic solvents are; HCL, H₂SO₄

8. 3. Protophillic Solvents: Protophillic solvents are basic in nature, which possess a high affinity for proton. Examples are; Liquid ammonia, amines, and ketone

9. 4. Amphiprotic Solvents: Amphiprotic solvents are those solvents which act as both Protogenic and Protophillic solvents. For example; Alcohols and week organic acids.