Which of the following is not possible sources of error when weighing chemicals? Not waiting until samples in heated glassware have cooled to room temperature Weighing by directly placing chemicals on the balance without using a weighing boat Zeroing the balance before beginning Using more than one balance for a series of related weightings
To weigh the chemicals, analytical balance is used.
The factors that influence the weight of a chemical while weighing using analytical balance are:
1) Room temperature:
Changes in room temperature influence the weight of the chemical.
Either the chemical may gain or lose water molecules when temperature is altered, so its weight varies.
So, chemicals should be cooled first to room temperature.
2) Wind in the room:
Sometimes the chemicals to be weighed may react with atmospheric gases and their weights may change.
3) Weighing pan :
Sometimes weighing pan may react with the chemicals. So chemicals should not be placed directly on the weighing pan.
4) Work space should be clean and user errors like leaving the chemical outside for long time, not properly placing the chemical on the pan or touching the chemical with hand etc. should be avoided.
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