Understanding Weighing Techniques

The video tutorial explains how to weigh solid and liquid samples using a top pan balance. It covers the use of a plastic weighing boat or a sample vial for solids, and a reaction flask for liquids. The process involves using a micro-spatula for small samples, resetting the balance, recording the mass, and cleaning up any spillages. The tutorial emphasizes the importance of accuracy and proper handling of equipment.

What is typically used to contain solid samples on a top pan balance?

• A metal tray

• A plastic weighing boat

• A glass beaker

• A paper envelope

Why might a small sample vial with a lid be used instead of a weighing boat?

• To increase visibility

• To minimize air exposure

• To prevent contamination

• To reduce weight

What tool is used to transfer small amounts of samples?

• A scoop

• A funnel

• A micro-spatula

• A pipette

What is the purpose of the tare button on a balance?

• To calibrate the balance

• To reset the balance to zero

• To increase sensitivity

• To lock the current weight

What should be done after removing the weighing boat from the balance?

• Reset the balance to zero

• Record the weight

• Turn off the balance

• Clean the balance

How can the mass of a liquid be measured using a top pan balance?

• By using a metal tray

• By using a reaction flask supported on a cork ring

• By using a plastic weighing boat

• By using a paper envelope

What should be done to the balance after measuring the liquid mass?

• Calibrate it

• Reset it to zero

• Turn it off

• Cover it