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A titration is a complexometric titration when the complexing agent is ethylenediaminetetraacetic acid (EDTA) and it is an acid-base titration when the hydrogen ion concentration of one of the solutions is determined. In this type of titration, a standard solution of a strong base, such as sodium hydroxide (NaOH) or potassium hydroxide (KOH), is added to a solution of weak acid until the desired endpoint is reached. The endpoint can be detected by any means, including pH metres, conductivity detectors, and colour indicators.
Meaning of Acid-Base Titration:
It is a type of titration in which the acidity or basicity of an unknown solution is determined by measuring the volume of base or acid required to neutralise it. The point at which the acid and base react to form water is called the equivalence point.
Types of Acid-Base Titration
There are two types of acid-base titration namely, complexometric and acid-base titrations.
Complexometric Titrations: In complexometric titrations, the endpoint is detected by complexation reactions. The titrant reacts with the analyte to form a complex. The change in colour of the solution is then used to determine the endpoint.
Titrations acid-base: Titrations acid-base are the most common type of titration. In these titrations, the endpoint is detected by an indicator. The indicator changes colour at the point when the acid and base have neutralised each other. Titration acid-base is the most common type of titration. In these titrations, the endpoint is detected by an indicator. The indicator changes colour at the point of neutralisation.
Alkalimetry: Another type of acid-base titration is alkalimetry. In this type of titration, a base is added to an acid until the solution reaches neutrality. The endpoint of this titration is also known as the inflexion point. Alkalimetry is also called acidimetry.
Further Classifications of Acid-Base Titration
The acid-base titrations can further be classified into the strong base with strong acid, weak acid-strong base, weak base with strong acid and weak acid-weak base.
Strong base with Strong acid-: The combination of a strong base with Strong acid results in a titration that is conducted at a near-neutral pH. An example of a Strong base with Strong acid is the reaction between hydrochloric acid and sodium hydroxide to form NaCl and water
Weak acid-strong base: A weak acid titrated with a strong base has a titration curve that is S-shaped. The pH at the endpoint is above seven and can be as high as 12. An example of a weak acid-strong base is the reaction between acetic acid and sodium hydroxide.
Weak base with Strong Acid: The titration of a weak base with Strong Acid has a pH at the endpoint that is below seven. This type of titration is used to determine the pKa of a weak base. An example of a Weak base with Strong Acid is the reaction between hydrochloric acid and ammonia.
Weak acid-weak base: The titration of a weak acid with a weak base has a pH at the endpoint that is near seven. This type of titration is used to determine the pKa of a weak acid or weak base. An example of a weak acid-weak base is the reaction between acetic acid and ammonia.
There are many different types of acid-base titrations, each with its own unique properties. By understanding the different types of titrations, you can choose the best method for your specific needs. Complexometric titration is one example of acid-base titration.
Importance of Acid-Base Titration
An acid-base titration is an important complexometric titration. They are used to find the concentrations of acids and bases. The acidity or basicity of a solution is determined by its pH. The pH is a measure of the hydrogen ion concentration in a solution. A solution with a pH less than seven is considered acidic and a solution with a pH greater than seven is considered basic.
There are many different types of acid-base titrations. The most common type is acid-base titration. In this type of titration, an acid is added to a base until the solution reaches neutrality. The point at which the solution reaches neutrality is called the endpoint.
At the endpoint of an acid-base titration, the solution will have a pH of seven. This is because the concentration of hydrogen ions and hydroxide ions in the solution will be equal. The endpoint of an acid-base titration can be determined using a pH metre.
Conclusion
In complexometric titrations, the endpoint is reached when the complex formed by the metal ion and ligand is large enough to be detectable. At this point, the complex absorbs light at a wavelength that is different from that of the metal ion-ligand complex. The endpoint in acid-base titrations is reached when the solution changes colour from acid to base or vice versa. The endpoint in complexometric titrations is more difficult to detect than in acid-base titrations. In this article, we dealt with acid-base titration, its types and its importance.
