Calculations of Weights and Volume Using
Session 7: Calculations of Weights and Volume Using
Specific Gravity
Total Session Time: 60 minutes
Prerequisites
Students Learning Tasks
By the end of this session students are expected to be able to:
Resources Needed:
SESSION OVERVIEW
|Step |Time |Activity/ |Content |
| | |Method | |
|1 |05 minutes |Presentation |Introduction, Learning Tasks |
|2 |40 minutes |Presentation |Calculation of Weight and Volume by |
| | |Group |Using Specific Gravity |
| | |discussion | |
|3 |05 minutes |Presentation |Key Points |
|4 | | Presentation |Evaluation |
| |10 minutes | | |
SESSION CONTENTS
STEP 1: Presentation of Session Title and Learning Tasks (5 minutes)
READ or ASK students to read the learning tasks and clarify
ASK students if they have any questions before continuing.
STEP 2: Calculating Weight and Volume by Using Specific Gravity
(40 minutes)
|Activity: Small Group Discussion ( 20 minutes) |
| |
|DIVIDE students into small groups |
| |
|ASK students to discuss in groups on the following questions |
|specific gravity of liquid paraffin is 0.86. |
| |
|[pic]REFER Students to Tanzania Pharmaceutical Hand Book |
| |
|ALLOW students to discuss for 15 minutes |
| |
|ALLOW each groups to present for 5 minutes |
| |
|CLARIFY and SUMMARIZE by using the contents below |
o Specific gravity is the weight of a substance compared with the weight
of an equal volume of water both having the same temperature
| |substance |
| |Weight of equal volume of |
| |water |
and the weight of equal volume of water (V) are known
Thus the formula will be:
specific gravity (SP GR) and weight of a given volume of a liquid (W) are
known
Thus the formula will be:
The following are the solutions for the above exercise:
STEP 3: Key Points (5 minutes)
weight of an equal volume of water both having the same temperature
STEP 4: Evaluation (10 minutes)
you have specific gravity and its weight?
you have specific gravity and its volume?
References
Ansel, H. C & Stocklosa, M. J. (2001). Pharmaceutical Calculations (11th
ed.). Philadelphia, United States: LIPPINCOTT WILLIAMS & WILKINS
Ansel, H. C (2010) Pharmaceutical Calculations (13rd ed.). Philadelphia,
United States: LIPPINCOTT WILLIAMS & WILKINS
Senya, S. S, Mwasha, C.Y, Muyinga, A. M, Amiri,R. I. and Mauga E.A.S.K.
(2011) Tanzania Pharmaceutical Handbook (2nd ed.). Dar eS Salaam,
Tanzania: School of Pharmaceutical Sciences.
New Jersey: John Wiley & Sons, Inc
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