Titration- Identification of an unknown acid

Question 1

The main purpose for the AB2 experiment is to:

Answer 1

determine the pKa(s) of an unknown acid and thus identify the unknown titrated

Question 2

It is important to have proper technique in addition of the titrant to:

Answer 2

ensure all equivalence points can be observed.

Question 3

Why is it important to condition the burette?

Answer 3

To ensure that all of the residual impurities are removed.

Question 4

For this experiment, we are running a neutralization reaction. The titrant is ______________ and it goes in the buret; the unknown acid goes in the _______ with a stir bar.

Answer 4

sodium hydroxide; beaker

Question 5

Why are bubbles in the burette bad?

Answer 5

It adds unnecessary error, distorting the buret volume reading.

Question 6

If 0.119 g of an unknown diprotic acid is being titrated with 16.0 mL of a standardized concentration of the NaOH solution (0.107 M). What is the molar mass of the unknown acid?

Answer 6

139 g/mol

Question 7

What does having an unstandardized solution of sodium hydroxide (NaOH) mean?

Answer 7

The exact concentration has not been determined.

Question 8

To store the pH probe, you should ensure that it is plugged in to charge upright and confirm that the tip is immersed in distilled water within its storage container.

Answer 8

False

Question 9

Consider this process: A student weighed out KHP using the weigh-by-difference technique. They performed steps in this order: 1) weighed the KHP vial, 2) removed the cap, 3) added a small amount of KHP to the Erlenmeyer flask, 4) re-weighed the vial, and 5) recapped the vial to put it away.

The student correctly performed the technique.

Answer 9

False