Page 97 - Practical Technology 2025

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Clinical Pharmacy-Pharm D Level Three 2 Semester 2024/2025 Pharmaceutical Technology (PT 607)

Problems on sieving and microscopy

1. A powder size analysis was carried out on 192 gm powder A using the
sieve method, the following data were obtained

• Draw a cumulative % frequency under and over size
• Calculate the mean granule diameter
Med point of Weight retained
size range Frequency
(n)

250 0
180 4.1

125 8.4
90 13.7
75 15.4
53 32.7
20 117.7

Solution

Med point Weight Cumulative Cumulative Cumulative
of size retained mass % Over % Under size
range Frequency retained size
(n)

250 0
180 4.1
125 8.4
90 13.7
75 15.4
53 32.7
20 117.7

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