STATISTICAL EVALUATION OF PENNIES
General Rules for the use of an Analytical Balance
1. Keep the balance and the area around it clean.
2. Never weigh anything heavier than the capacity of your balance (160 g.)
3. Make sure the object being weighed is at the same temperature as the balance.
4. Do not handle the object being weighed with your fingers, and do not rub glass objects with a cloth prior to weighing.
5. Never weigh chemicals directly on the metal weighing pan. We will use the 'weighing by difference' method whenever the analytical balance is used. The mass of sample is determined by the difference between an initial and a final weight.
6. Before using the balance for the first time that day, make sure that you calibrate the balance.
7. Whenever using the balance make sure the doors to the breeze shield are closed.
8. When you have finished weighing, make sure: a) The weight is recorded in your lab notebook; b) The balance is clean; c) Nothing is left on the pan; and d) The balance is off.
9. If the balance does not behave properly tell the instructor as soon as possible.