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11 Questions

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Operating a Centrifuge

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Questions and Answers

What is the approximate volume of a full squirt from a dropper?

1 mL

Why is it crucial to avoid contamination of the samples and chemical reagents in the procedures for separating and identifying the cations in a mixture?

To prevent false positive results

What is a potential way to contaminate a solution when using a glass stirring rod?

Laying the rod on a dirty lab bench

Why is distilled water required for the procedures for separating and identifying the cations in a mixture?

To prevent false positive results due to the presence of ions in tap water Signup and view all the answers

What could happen if you touch the tip of a medicine dropper to the side of a test tube?

Contaminants could be picked up and transferred to another solution Signup and view all the answers

What is the purpose of a centrifuge in a laboratory setting?

To separate the precipitate from the solution by rotating the sample rapidly to settle out the solid quickly. Signup and view all the answers

What is the importance of balancing test tubes in a centrifuge?

To prevent vibration and ensure safe operation. Signup and view all the answers

What should you do if the centrifuge starts vibrating during operation?

Turn it off immediately and call your instructor. Signup and view all the answers

Why is it crucial to use clean test tubes and pipets when working with samples?

To prevent contamination of the sample and ensure accurate results. Signup and view all the answers

Why are heating samples directly in small test tubes not recommended?

Because the sample can boil out quickly. Signup and view all the answers

Why are pipets or droppers used to measure and transfer small volumes of liquid?

Because they are more precise and convenient than graduated cylinders. Signup and view all the answers