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Titration of Citric AcidQuestion 11 ptsGroup of answer choicesBase is the solution of known concentration

In a titration, a solution of known concentration (acid or base) is used to determine the concentration of an unknown (acid or base). In this experiment, the:

Acid is the solution of known concentration


Both acid and base concentrations are unknown


Both acid and base concentrations are known

 

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Question 2

1 pts

Care should be taken when handling the sodium hydroxide solution, including the following steps

Group of answer choices



Wear PPE including goggles and gloves at all times


It is a good idea to wear a long sleeve shirt, long pants, and/or a lab coat


Do not dispense large amounts of sodium hydroxide outside of the hood


All of these

 

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Question 3

1 pts

The best method of assuring that the volume of the citric acid solution being titrated is exactly known, is to:

Group of answer choices



Use a beaker to measure the solution


Use a graduated cylinder to measure the solution


Use a volumetric pipette to measure and trasnfer the solution


None of these, the exact volume of solution isn't important

 

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Question 4

1 pts

Before beginning a titration, ask your lab partner to:

Group of answer choices



Remind you to add 3-4 drops of indicator


Verify the starting volume on the burette


Make sure you write down all the volumes


All the above

 

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Question 5

1 pts

The most important thing NOT to forget to do, before starting the titration, is to add 3-5 drops of indicator solution, becasue

Group of answer choices



The indicator is a catalyst that speeds up the titration


Without indicator, you have no idea when and where equivalence is reached


The more indicator you add, the better your results


A few extra drops of indicator always brings good luck

 

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Question 6

1 pts

You are instructed to do three replicate trials in the titration experiment. This is because:

Group of answer choices



Everyone has at least one bad run


You have 50 ml of solution, so why not?


Three trials gives you better statistical confidence, and the ability to compare run to run variation


Three is a lucky number in analytical chemistry

 

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Question 7

2 pts

15.0 ml of 0.1 M NaOH was used to titrate 20.0 ml of an unknown acid solution. The moles of base used to reach equivalence was:

Group of answer choices



0.150


0.015


0.0015


None of the above

 

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Question 8

2 pts

Given the moles base used in the previous calculation, and 37.5 ml of a diprotic acid being titrated, what would be the molarity of the acid solution?

Group of answer choices



0.200


0.020


0.002


None of these

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