AP Chemistry help » Laboratory methods and analysis » laboratory Equipment and Procedure » Laboratory equipment

You room trying to develop a new chemical structure. Girlfriend need exactly 9mL of phenyllithium because that your following reaction. I m sorry measuring device would it is in the many accurate to measure out that liquid?


Explanation:

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

You are watching: This is a piece of laboratory equipment used to measure mass in grams.

There is no such point as a 9mL clock glass. Despite a 10mL syringe and graduated cylinder would certainly be quite accurate, the 9mL volumetric pipet is much more accurate, and also remember the inquiry asked because that the best out the the answer choices. A maker is really inaccurate and should only be used to move solutions, not to measure up them.


An experiment calls for you come titrate a 

*
 solution that
*
 with a systems of
*
 of unknown concentration. The solution of
*
 is hosted in an Erlenmeyer flask. What item of laboratory equipment should you use to carry out the
*
 solution?


Explanation:

In a titration, you have to use a buret to administer the

*
 solution right into the
*
 solution. A buret provides you the many accuracy in to run the titration together you have the right to 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 clock glass and spatula would be inappropriate for this situation since you are dealing with liquids. Pouring from a graduate cylinder would not be precise enough and the titration outcomes would be subject to several error. A volumetric pipet will not allow you to store track the the volume necessary to finish the titration.


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Example concern #5 : activities Equipment and also Procedure


An experiment calls for measuring 

*
 of a systems in a graduated cylinder. How have to the i graduated cylinder be read?


Possible Answers:

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

*


Hold the i graduated cylinder therefore the meniscus is slightly above eye level, climate make certain the bottom of the meniscus is at 

*


Hold the graduated cylinder therefore the meniscus is in ~ eye level, climate make sure the bottom that the meniscus is at 


Crouch down until your head is on the same level together the table top, climate look come make sure the bottom that the meniscus is at 

*


Correct answer:

Hold the i graduated cylinder therefore the meniscus is at eye level, climate make certain the bottom of the meniscus is at 


Explanation:

In order for an accurate reading of a i graduated cylinder, host the graduated cylinder at eye level climate make certain the bottom that the meniscus is at the wanted volume. Having actually the graduated cylinder slightly listed below eye level will result in readings that are higher than they are supposed to be. Having the i graduated cylinder slightly over eye level will an outcome in readings that are lower than they are supposed to be. Never place your head on the same level together the table to check out a i graduated cylinder. If the graduated cylinder tips end for any reason, you will splash the solution organized within on your face.


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Example inquiry #1 : Laboratory devices


While conducting an experiment, you must measure exactly 

*
 of a sulfuric mountain solution. Which piece of equipment should you use?


Possible Answers:

Mohr pipette


*
 beaker


 volumetric pipette


Graduated cylinder


Correct answer:

 volumetric pipette


Explanation:

A volumetric pipette is made to dispense a certain amount of liquid really accurately. The Mohr pipette, beaker, and graduate cylinder will certainly not measure a details amount that liquid together accurately together the volumetric pipette.


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Example question #2 : Laboratory devices


While conducting one experiment, you are required to measure out exactly 

*
 of potassium hydrogen phthalate. What need to you usage to measure out the exactly amount?


Possible Answers:

Erlenmeyer flask


Triple beam balance


Analytical balance


Centigram balance


Correct answer:

Analytical balance


Explanation:

Potassium hydrogen phthalate is a solid at room temperature, for this reason we deserve to use a balance and a weigh watercraft or weigh paper. Once measuring specific amounts that chemicals, an analysis balance will certainly be maybe to carry out the most accurate analysis of mass. 


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Example question #3 : Laboratory tools


For an experiment, girlfriend are compelled to warm a sample the a solid to very high temperatures. What piece that laboratory tools should you usage to heat the solid?


Possible Answers:

Test tube


Erlenmeyer flask


Crucible


Beaker


Correct answer:

Crucible


Explanation:

When you need to warm anything as much as high temperatures, you need to use a crucible. Glassware is no able to stand up to as much heat as a crucible.


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Example concern #4 : Laboratory tools


An experiment requires you to mix a systems of 

*
 with a equipment of 
*
 and then observe the reaction. What have to the solutions be combined in?


Possible Answers:

A beaker


A volumetric pipet


A graduated cylinder


A buret


Correct answer:

A beaker


Explanation:

A manufacturer is the best choice for mixing these 2 solutions. I graduated cylinders, burets, and also pipets are all provided to measure certain amounts the solution. Also, stirbars have the right to be easily included to beakers come facilitate the reaction.


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Example concern #5 : Laboratory tools


You are required to uncover the absorbance of a particular solution. What piece of equipment should girlfriend use?


Possible Answers:

Litmus paper


Chromatography paper


Analytical balance


Spectrophotometer


Correct answer:

Spectrophotometer


Explanation:

A spectrophotometer must be used because it is supplied to measure absorbance at details wavelengths. An analysis balance is offered for measure up mass. Chromatography record is offered to separate various pigments found in a chemical. Litmus document is supplied to recognize the pH the a substance.


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