Pour vinegar in until the eggs are completely ... Carefully, place the membrane egg into the middle of the syrup. Leave for at least one day (roughly 10 hours). Has the egg shrivelled up?
Repeat steps 5 and 6 for the antacid tablet. What do you observe? The eggshell and the antacid tablet shouldn’t do anything interesting in the water but they should cause bubbling in the vinegar.