Question

please give an example of a titration in which olfactory indicators are used to determine the endpoint.

Answer 1

Olfactory indicators can be used in the laboratory to test whether a solution is a base or an acid, a process called olfactory titration.

Onion, clove oil and vanilla extract are examples.

Onion as olfactory indicator

Put some finely chopped onions in a plastic bag along with some clean cloth strips. Tie up the bag tightly and keep it over night in the fridge.

Check the odor of the cloth strips.

Keep two strips on a clean surface.

Put a few drops of dilute HCl on one strip and a few drops of dilute NaOH on the other.

Rinse both the strips separately with distilled water

Again check their odor .

Answer 2

phenolphthalein is an example of titration in which oil factory indicator are used to determine the end.
See I'm not sure maybe it is right .