To determine the concentration of ethanoic acid in vinegar

Step 1

Dilute vinegar in a volumetric flask

Step 2

Pipette sodium hydroxide solution into a conical flask

Step 3

Add phenolphthalein to the conical flask

Step 4

Rinse burette with vinegar solution and fill it to the 0 mark

Step 5

Add acid as conical flask is swirled

Step 6

Continue until sodium hydroxide turns from pink to colourless and repeat twice

Why is vinegar diluted?

Ensures only a small amount of base is needed

Colour change of this experiment

CPink to colourless

What salt is formed in this experiment?

Sodium ethanoate

Safety percautions (2)

Wear safety goggles. Lab coat

Draw a diagram of this experiment