Tablet powder containing 80 mg of promazine hydrochloride is ground to a paste with 10 ml of 2 M HCl. The paste is then diluted with 200 ml of water, shaken for 15 min and finally made up to 500 ml. A portion of the extract is filtered. Then, 5 ml of the filtrate is taken and diluted to 120 ml with 0.1 M HCl.  – Absorbance reading=0.755 is read at a wavelength wavelength of 251 nm  – A (1%, 1 cm) value of promazine.HCl at 251 nm=935  – Stated content of promazine.HCl per tablet=50 mg  – Weight of 20 tablets=1.667 g  – Weight of tablet powder taken for assay=163 mg expected content in tablet taken is:   A-97.78 g/mL B-97.78 g/100ml C-0.0097g/mL D-97.78 mg/100ml   Concentration in diluted tablet extract is:   A-0.81g/mL B-80 g/100ml C-0.00081g/mL D-0.807 mg/100ml       Concentration in original  tablet extract is:   A-19.38g/mL B-16.15 mg/100ml C-19.38 mg/100ml D-16.15 mg/mL     Amount of  promazine.HCl in original extract is:   A-96.90mg B-80.75mg C-96.90mg/100ml D-80.75mg/100ml     percentage of stated content is: A-99.1 mg B-80.75mg C-99.1 mg/100ml D-80.75mg/100ml

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Spectroanalytical Methods

Spectroanalytical methods measure the wavelength and intensity of radiations that are either emitted or absorbed by a molecular or atomic species. These methods are useful for evaluating the electronic or atomic arrangement of the molecules of a given analyte.