What is the procedure of using an olfactory indicator?
Answers
Chemicals that change colour with pH are frequently used as indictors for acid-base titrations. The aim of this experiment it to determine the concentration of an unknown base using garlic powder as an olfactory
Chemicals that change colour with pH are frequently used as indictors for acid base titrations; however it is also possible to use chemicals that change odour with pH – termed ‘olfactory indicators’. The aim of this experiment it to determine the concentration of an unknown base using garlic powder as an olfactory indicator, and to analyse the accuracy and precision of the results.
Lesson organisation
You have to decide if this experiment is suitable to use with different classes, and look at the need for preliminary training in using techniques involved in tritration. What follows here is an experiment were titration techniques can be practised and polished as it allows for an interesting comparison between indicators and and assessment if accuracy at determining the end-point of this strong acid-strong base titration. If is expected that this class practical will take 60 minute to complete
Answer:
An Olfactory indicator is a substance whose smell varies depending on whether it is mixed with an acidic or basic solution. Olfactory indicators can be used in the laboratory to test whether a solution is a base or an acid, a process called olfactory titration.
Simply put, olfactory indicators are substances which have a different odour in acid and base solutions. For eg: Vanilla extract has a characteristic pleasant smell, onion and clove oil, etc.