Waiting
Login-Verarbeitung ...

Trial ends in Request Full Access Tell Your Colleague About Jove

2.18: Titrimetric Methods: Types and Commonly Used Strategies

TABLE OF
CONTENTS
JoVE Core
Analytical Chemistry

Ein Abonnement für JoVE ist erforderlich, um diesen Inhalt ansehen zu können. Melden Sie sich an oder starten Sie Ihre kostenlose Testversion.

Education
Titrimetric Methods: Types and Commonly Used Strategies
 
TRANSCRIPT

2.18: Titrimetric Methods: Types and Commonly Used Strategies

In chemistry, titrimetric methods are broadly classified into three types: volumetric, gravimetric, and coulometric. Volumetric titrations involve measuring the volume of a titrant of known concentration that is required to react completely with an analyte. In gravimetric titrations, the standard solution reacts with the analyte to form an insoluble precipitate, which is filtered, dried, and weighed. In coulometric titrations, current is applied to an electrochemical reaction until the reaction is complete, and the charge required for this reaction is calculated to determine the amount or concentration of the reactant(s).

Generally, in titrations, a titrant with a known concentration is added to the analyte until the analyte is consumed, i.e. when the endpoint is reached. In this case, the process is called direct titration. In some cases, the reaction may be too slow for a sharp endpoint to be obtained. In such cases, back titration is used. In a back titration, the analyte is allowed to react with an excess amount of a standard solution, and the remaining quantity of this standard solution is titrated with a second standard solution. The exact amount of the first standard solution required to react with the analyte can then be calculated.

Sometimes, no suitable indicator can be found for either a direct or an indirect (back) titration. In this case, displacement titration can be used, in which the analyte displaces a reagent, usually from a complex, and the displaced reagent is measured by titration.

Tags

Keywords: Titrimetric Methods Volumetric Titrations Gravimetric Titrations Coulometric Titrations Direct Titration Back Titration Displacement Titration Analyte Titrant Endpoint Standard Solution

Get cutting-edge science videos from JoVE sent straight to your inbox every month.

Waiting X
Simple Hit Counter