Acid-base extraction :benzoic acid, p-nitroaniline and azobenzene in dichloromethane.  1.why is anhydrous sodium sulphate added to the organic solution? 2. Why was the water used for washing the precipitates on the funnels specified to be cold? 3. Why are the acidic extracts and basic extracts cooled before neutralization?

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NMR Spectroscopy

NMR stands for Nuclear Magnetic Resonance in which the study of different molecules is done based on the interaction of radiofrequency electromagnetic radiations with the nuclei of molecules placed in a strong magnetic field. A precise study of spectra of visible light and all bands of electromagnetic radiation is called spectroscopy.