Chemistry stinks - olfactory indicators experiment

Description

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 indicator.

chemistry-stinks-olfactor...



Apparatus Chemicals

Eye protection

Beaker (500cm3), 2

Parafilm or watch glass

Each working group requires:

Burette (25 cm3)

Pipette (10cm3)

Small funnel

Conical flasks (50cm3 or 100cm3), 3

Hydrochloric acid solution, HCl(aq) (1 M) (IRRITANT) 250cm3

Sodium hydroxide solution, NaOH(aq) (approx. 1 M) (IRRITANT) 100cm3

Garlic powder (May cause allergic response and skin/eye irritation), approx. 0.4g

Refer to Health & Safety and Technical notes section below for additional information.






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 indicator.

ADDITIONAL INFORMATION

The Royal Society of Chemistry would like to thank Dr Jacob Cox, Dr Simon Rees, Rebecca Edwards and Kate Madden as part of the Educational Techniques Group (ETG) for their involvement in the development of this resource.