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Tablet powder containing 100mg of promazine hydrochloride is ground to a paste  with 10 ml of 2 M HCl. The paste is then diluted with 300 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 200 ml with 0.1 M HCl.  – Absorbance reading=0.855 is read at a wavelength wavelength of 251 nm  – a (1%, 1 cm) value of promazine.HCl at 251 nm=950  – Stated content of promazine.HCl per tablet=60 mg  – Weight of 24 tablets=1.500g  – Weight of tablet powder taken for assay=180 mg expected content in tablet taken is:   172.8 mg 1000mg 100 mg 100g   Concentration in diluted tablet extract is:   0.1g/mL 0.9 g/100ml 1.11 g/mL 0.9 mg/100ml       Concentration in original  tablet extract is:   36g/mL 36 mg/100ml 19.38 mg/100ml 16.15 mg/mL     Amount of  promazine.HCl in original extract is:   172.8mg 180mg/100ml 96.90mg 180mg     percentage of stated content 99.1 % 96% 80.75mg/100ml 104.2%

Tablet powder containing 100mg of promazine hydrochloride is ground to a paste  with 10 ml of 2 M HCl. The paste is then diluted with 300 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 200 ml with 0.1 M HCl.  – Absorbance reading=0.855 is read at a wavelength wavelength of 251 nm  – a (1%, 1 cm) value of promazine.HCl at 251 nm=950  – Stated content of promazine.HCl per tablet=60 mg  – Weight of 24 tablets=1.500g  – Weight of tablet powder taken for assay=180 mg expected content in tablet taken is:   172.8 mg 1000mg 100 mg 100g   Concentration in diluted tablet extract is:   0.1g/mL 0.9 g/100ml 1.11 g/mL 0.9 mg/100ml       Concentration in original  tablet extract is:   36g/mL 36 mg/100ml 19.38 mg/100ml 16.15 mg/mL     Amount of  promazine.HCl in original extract is:   172.8mg 180mg/100ml 96.90mg 180mg     percentage of stated content 99.1 % 96% 80.75mg/100ml 104.2%

Principles of Instrumental Analysis
Principles of Instrumental Analysis
7th Edition
ISBN:9781305577213
Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Chapter1: Introduction
Section: Chapter Questions
Problem 1.9QAP
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Tablet powder containing 100mg of promazine hydrochloride is ground to a paste

 with 10 ml of 2 M HCl. The paste is then diluted with 300 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 200 ml with 0.1 M HCl.

 – Absorbance reading=0.855 is read at a wavelength wavelength of 251 nm

 – a (1%, 1 cm) value of promazine.HCl at 251 nm=950

 – Stated content of promazine.HCl per tablet=60 mg

 – Weight of 24 tablets=1.500g

 – Weight of tablet powder taken for assay=180 mg

expected content in tablet taken is:

 

172.8 mg
1000mg
100 mg
100g

 

Concentration in diluted tablet extract is:

 

0.1g/mL
0.9 g/100ml
1.11 g/mL
0.9 mg/100ml

 

 

 

Concentration in original  tablet extract is:

 

36g/mL
36 mg/100ml
19.38 mg/100ml
16.15 mg/mL

 

 

Amount of  promazine.HCl in original extract is:

 

172.8mg
180mg/100ml
96.90mg
180mg

 

 

percentage of stated content

99.1 %
96%
80.75mg/100ml
104.2%
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