Operating a Centrifuge

1 mL

To prevent false positive results

Laying the rod on a dirty lab bench

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

<p>Contaminants could be picked up and transferred to another solution</p> Signup and view all the answers

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

<p>To prevent vibration and ensure safe operation.</p> Signup and view all the answers

<p>Turn it off immediately and call your instructor.</p> Signup and view all the answers

<p>To prevent contamination of the sample and ensure accurate results.</p> Signup and view all the answers

<p>Because the sample can boil out quickly.</p> Signup and view all the answers

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

The volume of liquid a dropper typically dispenses.

To prevent the introduction of unwanted substances that can alter the results.

A common way to contaminate a solution during preparation is by using a dirty stirring rod.

Distilled water is essential to prevent the introduction of ions from tap water, which can interfere with the accurate identification of cations.

Touching a dropper tip to a test tube can introduce contaminants from the test tube into the dropper, contaminating the solution.

A laboratory tool used to separate solids from liquids by rapidly rotating the sample. This causes the heavier solid particles to settle at the bottom of the tube.

Balancing test tubes in a centrifuge ensures equal weight distribution, preventing excessive vibrations and accidents.

If the centrifuge starts vibrating during operation, it should be stopped immediately to prevent potential damage or accidents.

Using clean test tubes and pipets helps prevent contamination of the sample and ensure accurate results.

Heating small samples directly in test tubes can cause them to boil very quickly. This can result in sample loss and potential hazards.

Pipets and droppers are preferred for small volumes because they offer more precise and convenient measurement and transfer compared to graduated cylinders.