AP Chemistry : Laboratory Equipment

Study concepts, example questions & explanations for AP Chemistry

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Example Questions

Example Question #1 : Laboratory Equipment

You are trying to create a new chemical structure. You need exactly 9mL of phenyllithium for your next reaction. Which measuring tool would be the most accurate to measure out that liquid?

Possible Answers:

10mL graduated cylinder 

9mL volumetric pipet

10mL syringe

100mL beaker

9mL watch glass

Correct answer:

9mL volumetric pipet

Explanation:

When measuring any liquid in the lab, a volumetric pipet or flask is always going to be the most accurate. This makes the 9mL volumetric pipet the best choice.

There is no such thing as a 9mL watch glass. Though a 10mL syringe and graduated cylinder would be quite accurate, the 9mL volumetric pipet is more accurate, and remember the question asked for the best out of the answer choices. A beaker is very inaccurate and should only be used to transfer solutions, not to measure them.  

Example Question #6 : Laboratory Equipment And Procedure

An experiment calls for you to titrate a  solution of  with a solution of  of unknown concentration. The solution of  is held in an Erlenmeyer flask. What piece of laboratory equipment should you use to administer the  solution?

Possible Answers:

Volumetric pipet

Buret

Graduated cylinder

Watch glass and spatula

Correct answer:

Buret

Explanation:

In a titration, you should use a buret to administer the  solution into the  solution. A buret gives you the most accuracy in running the titration as you can dispense the solution drops at a time. The buret will also allow you to accurately determine the volume of  needed to complete the titration. A watch glass and spatula would be inappropriate for this situation because you are dealing with liquids. Pouring from a graduate cylinder would not be accurate enough and the titration results would be subject to lots of error. A volumetric pipet will not allow you to keep track of the volume needed to complete the titration.

Example Question #7 : Laboratory Equipment And Procedure

An experiment calls for measuring  of a solution in a graduated cylinder. How should the graduated cylinder be read?

Possible Answers:

Hold the graduated cylinder so the meniscus is at eye level, then make sure the bottom of the meniscus is at 

Hold the graduated cylinder so the meniscus is slightly above eye level, then make sure the bottom of the meniscus is at 

Hold the graduated cylinder so the meniscus is slightly below eye level, then make sure the bottom of the meniscus is at 

Crouch down until your head is on the same level as the table top, then look to make sure the bottom of the meniscus is at 

Correct answer:

Hold the graduated cylinder so the meniscus is at eye level, then make sure the bottom of the meniscus is at 

Explanation:

In order for an accurate reading of a graduated cylinder, hold the graduated cylinder at eye level then make sure the bottom of the meniscus is at the desired volume. Having the graduated cylinder slightly below eye level will result in readings that are higher than they are supposed to be. Having the graduated cylinder slightly above eye level will result in readings that are lower than they are supposed to be. Never place your head on the same level as the table to read a graduated cylinder. If the graduated cylinder tips over for any reason, you will splash the solution held within on your face.

Example Question #2 : Laboratory Equipment

While conducting an experiment, you need to measure exactly  of a sulfuric acid solution. Which piece of equipment should you use?

Possible Answers:

Graduated cylinder

 volumetric pipette

Mohr pipette

 beaker

Correct answer:

 volumetric pipette

Explanation:

A volumetric pipette is made to dispense a specific amount of liquid very accurately. The Mohr pipette, beaker, and graduate cylinder will not measure a specific amount of liquid as accurately as the volumetric pipette.

Example Question #3 : Laboratory Equipment

While conducting an experiment, you are required to measure out exactly  of potassium hydrogen phthalate. What should you use to measure out the correct amount?

Possible Answers:

Analytical balance

Erlenmeyer flask

Triple beam balance

Centigram balance

Correct answer:

Analytical balance

Explanation:

Potassium hydrogen phthalate is a solid at room temperature, so we can use a balance and a weigh boat or weigh paper. When measuring precise amounts of chemicals, an analytical balance will be able to provide the most accurate reading of mass. 

Example Question #2 : Laboratory Equipment

For an experiment, you are required to heat a sample of a solid to very high temperatures. What piece of laboratory equipment should you use to heat the solid?

Possible Answers:

Test tube

Erlenmeyer flask

Crucible

Beaker

Correct answer:

Crucible

Explanation:

When you need to heat anything up to high temperatures, you must use a crucible. Glassware is not able to withstand as much heat as a crucible.

Example Question #3 : Laboratory Equipment

An experiment requires you to mix a solution of  with a solution of  and then observe the reaction. What should the solutions be mixed in?

Possible Answers:

A volumetric pipet

A buret

A beaker

A graduated cylinder

Correct answer:

A beaker

Explanation:

A beaker is the best choice for mixing these two solutions. Graduated cylinders, burets, and pipets are all used to measure specific amounts of solution. Also, stirbars can be easily added to beakers to facilitate the reaction.

Example Question #6 : Laboratory Equipment

You are required to find the absorbance of a specific solution. What piece of equipment should you use?

Possible Answers:

Analytical balance

Chromatography paper

Litmus paper

Spectrophotometer

Correct answer:

Spectrophotometer

Explanation:

A spectrophotometer should be used because it is used to measure absorbance at specific wavelengths. An analytical balance is used for measuring mass. Chromatography paper is used to separate different pigments found in a chemical. Litmus paper is used to determine the pH of a substance.

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