Page 35 - A Guide to Dosage Form 1

Weighing
You will have a weighing balance available on your bench. Each time before you start your practical,
ensure that the balance is in good condition and is functioning properly. The resting point of the balance
must be stable at 0 mg when not in use. At all time, please ensure that your balance is clean and free
from any residual powder or liquid. Always use a weighing boat/paper to weigh the necessary
ingredients. Use a new weighing boat/paper for each ingredient.

Your balance is labelled with its minimum and maximum weighable quantity, besides its decimal
points (sensitivity). Usually, your balance’ minimum weighable quantity (MWQ) is 200 mg. Hence, you
could only weigh accurately at 200 mg or more, meaning to say that if your formula requires an amount
smaller than 200 mg, a dilution method will be necessary. You will learn this technique as we go through
this course.

Equipment / Glassware

Each of you will have your own drawer with your own glassware. You are responsible with all the
glassware.

At the beginning of each practical session, please ensure that all your glassware are available
in your designated drawer. If you fail to do so, you will have to pay for any missing glassware. You are
also responsible to pay for any broken glassware.

Please ensure that you use a suitable equipment each time. If you are unsure, you can ask the
lecturer in-charge. The glassware/equipment that you use should be specified in your worksheet/report.
Some important points are as follow: