TITRATION

Question 1

Before you start titrating make sure to get the ____ that you will use.

Answer 1

molarity of the NaOH

Question 2

Rinse first the ___ with distilled water to remove traces of chemicals that may be present in it. Rinse it again with the ___ solution to make sure that the burette only contains NaOH solution.

Answer 2

burette ; standardized NaOH

Question 3

Fill the burette ___ with NaOH solution and then flush the ___ of burette to remove the ____. It is now ready for used in titration. Make sure to record the ____ of NaOH before you start for Trial 1.

Answer 3

up to the top ; tip ; trap air bubbles : initial volume

Question 4

Rinse the pipette by drawing in some __ using the ___. After rinsing with water, a couple of times.

Answer 4

distilled water : aspirator

Question 5

Repeat the rinsing using the ___. After rinsing the volumetric pipet draw exactly ___ and transfer it in the flask.

Answer 5

vinegar solution ; 5 ml vinegar solution

Question 6

Add ___ into the flask. The solution is now ready for titration.

Answer 6

20 ml distilled water and 5 drops of phenolphthalein indicator

Question 7

Add NaOH to the flask. Titrate until the solution is light pink which corresponds to the ____. You are near the equivalence point if the pink color of the solution ___

Answer 7

equivalence point ; takes longer to disappear when we swirl the flask.

Question 8

Record the trial volume of the NaOH for the first trial. Repeat the titration ___

Answer 8

two or more times.