Choosing and Using Balances in Laboratories

This video tutorial explains the correct usage of an analytical balance, emphasizing its role in precise measurements for preparing chemicals and standards. It highlights the different types of balances available in the lab, each with specific purposes, and provides detailed instructions on how to use them correctly, including leveling, taring, and ensuring accurate readings.

What is the primary purpose of the analytical balance in room 203?

• Measuring liquids

• Routine weighing of samples

• Weighing large quantities of reagents

• Preparing accurately weighed chemicals for standards

Which balance is most suitable for weighing liquids?

• Top-loading balance

• Analytical balance

• Balance with five decimal places

• Balance with four decimal places

What is the precision of the balance used for weighing soil samples?

• Two decimal places

• Three decimal places

• Five decimal places

• Four decimal places

When choosing a balance, what factors should be considered?

• The size of the balance

• The color of the balance

• The range and precision required

• The brand of the balance

What should be checked to ensure the balance is ready for use?

• The balance is on a stable surface and free from drafts

• The balance is turned off

• The balance is placed near a window

• The balance is covered

What should be done if the balance pan is not properly seated?

• Turn off the balance

• Adjust the pan mechanism

• Add more weight to the pan

• Ignore it and proceed

What is the first step in using the balance?

• Place the object on the pan

• Press the tare button

• Turn off the balance

• Record the weight

What should be done if a container is used for weighing?

• Place the container and record the weight

• Add the container's weight to the total

• Ignore the container's weight

• Press the tare button after placing the container

Where should the object be placed on the balance for accurate measurement?

• On top of the balance

• On the edge of the pan

• In the center area of the pan

• Near the display

What should be done after recording the weight?

• Turn off the balance

• Add more weight to the pan

• Remove any spilled material and replace the draft guard

• Repress the tare button