comment on suitability of running infared spectrum under the following conditions:
A neat spectrum of liquid with a boiling point of 150 C is determined with salt plates.
and same question but at 35 C
The second one would have a high vapor pressure because of the low boiling point; however, I don't see how that could affect the spectrum if you managed to get enough sample into the cell.
The suitability of running an infrared (IR) spectrum under different conditions depends on various factors. In the case of determining a neat spectrum of a liquid with a boiling point of 150°C using salt plates, there are a few considerations to make:
1. Temperature: Infrared spectroscopy typically works well for analyzing liquid samples at room temperature since it allows for a more accurate representation of the sample's IR spectrum. However, if the boiling point of the liquid is significantly higher than room temperature (as in this case, 150°C), it could present challenges. Heating the liquid to such a high temperature may potentially cause evaporation and alter the sample's composition. This could lead to inaccurate spectral results.
2. Salt Plates: Salt plates are commonly used in infrared spectroscopy due to their transparency in the infrared region. They allow the IR radiation to pass through and interact with the sample for analysis. Using salt plates is suitable for obtaining high-quality IR spectra, as long as they are compatible with the sample. However, it's important to ensure that the sample does not react with or dissolve the salt plates.
Considering these factors, running an infrared spectrum of a liquid with a boiling point of 150°C using salt plates might pose some challenges. The high temperature could potentially affect the stability and composition of the liquid, leading to inaccuracies in the resulting IR spectrum.
Now, let's address the same question but at 35°C:
Running an infrared spectrum of the liquid at 35°C would generally be more suitable compared to running it at 150°C. This is because the sample remains closer to its normal operating temperature, reducing the risk of evaporation and composition alterations. The IR spectrum obtained under such conditions would likely provide a more accurate representation of the liquid's molecular structure.
However, it is important to note that even at 35°C, precautions should still be taken when using salt plates. Ensure that the sample is compatible with the salt plates and does not react with them. This will help avoid any interference or degradation of the spectral results.
In summary, it is generally more suitable to run an infrared spectrum of a liquid with a boiling point of 150°C using salt plates at a lower temperature, such as 35°C, to minimize the risk of sample evaporation and potential compositional changes.