A volumetric analysis in which the endpoint of the analysis or titration is identified by the formation of a colored complex is known as complexometric titration. It is mostly used to determine the concentration of a mixture of metal ions in a sample solution.
In these titrations, an indicator is used to indicate the endpoint, which is based on the formation of a complex among the titrant and the solute. Types of complexometric titrations include a direct, replacement, back titration, etc.
What is back titration in complexometric titration?
A back-titration can also be known as indirect titration. A back titration is a titration method that involves reacting an analyte with a known amount of excess reagent to determine its concentration. The remaining excess reagent is then titrated with a different, second reagent.
The result of the second titration shows how much excess reagent was used in the first titration, allowing the concentration of the original analyte to be determined. An indirect titration is also known as back titration.
How is a back titration performed?
A back titration usually consists of two steps:
- An excess of reagent is allowed to react with the volatile analyte.
- Titration is performed on the remaining quantity of known solutions.
This is a method of calculating the excess quantity by measuring the amount consumed by the analyte.
It is a two-step method in which the titrand is reacted with a specific, excess amount of titrant whose concentration is known. Instead of titrating the original sample, a known excess of the standard reagent is added to the solution, and titration is performed. The standard titrant will then react with the analyte, and the excess remains in the solution. A back-titration can be used to detect how much standard reagent is left.
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