Most of the daily products we encounter contain dissolved chemicals which can be harmful when present in high concentrations. For example, too much alkali in body wash and shampoos can cause skin irritation. Chemists can check the concentration of these chemicals by carrying out volumetric analysis.
To do volumetric analysis, we use a method called titration which involves:
- a solution of unknown concentration (analyte in conical flask)
- a solution of known concentration (titrant in the burette)
Titrations are used to obtain quantitative information about chemical reactions, such as the concentration of a solution or establish the stoichiometry of a reaction.
Direct titrations that involve the use of an acid, such as hydrochloric acid and a base, such as sodium hydroxide, are called acid-base titrations.
In a typical titration, a known volume of a standard solution of one reactant (or a reactant with known concentration) is measured into a conical flask, using pipette. A solution of the other reactant (with unknown concentration) is then added, from a burette, slowly into the conical flask, until the reaction between the two substances is complete.
For an acid-base neutralisation reaction, the completion of the reaction is often found by noting the colour … Continue reading ...