Hello Everyone,
While doing Boehm titration,
We use nahco3 in order to determine carboxylic acids. Then the mixture was agitated. After a while, the solution was filtred and HCl was added. After a while we titrated with naoh. İs it true? Could you please suggest any documents for boehm titration and calculation. İş there any method better than boehm titration. Thanks on advance
Boehm titration using NaHCO3 to determine carboxylic acids, followed by filtration, HCl addition, and NaOH titration is correct. Alternatives include FTIR, XPS, and TPD, but Boehm titration remains popular for its simplicity and low cost.
Improvements/Alternatives to Boehm Titration
While Boehm titration is a widely used method, it has some limitations:
- Time-consuming: The titration process is relatively slow due to the required agitation time.
- Inaccuracy: The method relies on several assumptions, and the results can be influenced by experimental conditions.
- Limited information: It only provides information about acidic groups and does not differentiate between different types of carboxylic groups.
Some alternative methods for characterizing surface functional groups include:
- Infrared spectroscopy (FTIR): Provides direct information about functional groups present on the surface. 1. Fourier Transform Infrared Spectroscopy (FTIR) - EAG Laboratories (see here for more: www.eag.com)
- Nuclear magnetic resonance (NMR) spectroscopy: Can be used to identify and quantify specific functional groups. 1. NMR Spectroscopy | Laboratory Analysis Services - Measurlabs measurlabs.com
- Thermogravimetric analysis (TGA): Can be used to estimate the total amount of oxygen-containing functional groups.
- X-ray photoelectron spectroscopy (XPS): Provides quantitative information about surface elemental composition and functional groups. 1. X-Ray Photoelectron Spectroscopy (XPS - SERC - Carleton (see here for more: serc.carleton.edu)
Choosing the best method depends on the specific requirements of your research and the available instrumentation.
Recommended Documents for Boehm Titration
You are advised to search for research articles that have used Boehm titration to characterize similar materials to your sample.
To identify carboxylic acids, I believe TPD analysis is more effective for characterizing carboxylic groups. This method can also quantify these groups.
Use back titration to minimize errors , particularly error due to the presence of CO2 in air.
Find more in the following paper:
https://doi.org/10.3390/c4020021
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