Find the Concentration of Ethanoic Acid in Vinegar(Complete)

Question 1

What indicator do we use in this titration and why?

Answer 1

Phenolphthalein.

Weak acid strong base.

Question 2

What is the colour change in the experiment?

Answer 2

Pink to colourless.

Question 3

What acids and bases are used in this experiment?

Answer 3

NaOH- strong base.

CH3COOH- weak acid.

Question 4

What must you do to the vinegar and why?

Answer 4

Dilute the vinegar by a factor of 10 because the acid is too concentrated.

Question 5

Describe the procedure for accurately measuring the sample of vinegar and diluting it.

Answer 5

Rinse the pipette with deionised water.
Rinse the pipette with vinegar.
Pipette the vinegar.
Read from the bottom of the meniscus at eye level.
Pour the contents of the pipette into a volumetric flask.
Tap the tip of there pipette against the volumetric flask.
Fill with deionised water.
Add deionised water drop wise when their the calibration mark.
Read from the bottom of the meniscus at eye level.
Stopper and invert 10 times to make sure that the solution is homogeneous.

Question 6

Ethanoic acid is a carboxylic acid, identify the carboxylic acid which occurs in nettles and stinging ants.

Answer 6

Methanoic acid.