Chemistry Titration 3 - to determine the concentration of ethanoic acid in vinegar using Sodium Hydroxide

1

Pipette 2 25cm³ samples of vinegar into a 250cm³ volumetric flask. Fill with deionised water until bom.hgm.ael. Dilution factor 5.

2

rinse pipette with deionised water and NaOH solution

3

Pipette 25cm³ NaOH into conical flask. add 1 drop phenolphthalein

4

Rinse burette with deionised water and vinegar. using funnel Fill with diluted vinegar to 1cm above 0 mark. remove funnel and adjust so bom.hgm.ael.

5

place white tile on the base of retort stand, place conical flak on top

6

titrate NaOH against diluted vinegar. Colour change from clear to pink

7

perform 2 more titrations or until results are within 0.1cm³

8

using reults, work out concentration of ethanoic acid in vinegar.

chemicals needed

vinegar, standard sodium hydroxide solution, phenolphthalein indicator, deionised water