Using a Balance Safely in a Laboratory

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What is the primary purpose of replacing the balance cover after placing the container on the balance pan?

To reduce fluctuations in the balance reading (correct)

To prevent contamination of the chemical

To prevent the chemical from reacting with air

To protect the balance from corrosion

Why should you never hold down the TARE button or bar on the balance?

It will damage the balance cover

It will erase the balance's memory

It will cause the balance to malfunction

It will switch the balance to a different unit of measurement (correct)

What should you use to clean the balance pan if a chemical is spilled on it?

A wet cloth

The attached brush (correct)

A paper towel

A dry spatula

Why should you never return excess chemical to its original container?

It may contaminate the original container (C) Signup and view all the answers

What should you do if you weigh out too much chemical?

Transfer the excess to a secondary container (C) Signup and view all the answers

What type of equipment is suitable for weighing chemicals?

Weigh boats, weigh paper, or glassware (A) Signup and view all the answers

What is the primary purpose of rinsing a buret with a small amount of solution before filling it?

To remove any impurities from the buret (B) Signup and view all the answers

What is the function of the stopcock in a buret?

To allow small amounts of the solution to flow out of the buret (D) Signup and view all the answers

What is the correct procedure for removing a container from a balance pan?

Remove the container and then replace the balance cover (D) Signup and view all the answers

What is the purpose of using an indicator in a titration reaction?

To indicate the completion of the reaction by a color change (C) Signup and view all the answers

Why is it important to replace the appropriate lids on all reagent bottles when finished?

To prevent contamination of the reagents (A) Signup and view all the answers

What is the significance of the zero mark on a buret?

It is the point where the buret is filled to (D) Signup and view all the answers

When using a buret, how is the volume typically found?

By reading the number of tenths of milliliters and estimating hundredths of milliliters (D) Signup and view all the answers

What is the purpose of keeping reagents on the plastic on the center bench?

All of the above (D) Signup and view all the answers

Why should you never put anything back into the reagent bottle?

To prevent contamination of the reagent (D) Signup and view all the answers

What is the approximate cost of the balances you will be using?

$2000 to $2500 (A) Signup and view all the answers

Why should you use an appropriately labeled spatula for each reagent bottle?

To prevent contamination of the reagent (B) Signup and view all the answers

What should you do with excess solid reagent after use?

Pour it into a beaker or onto weighing paper (D) Signup and view all the answers