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With NaOH

Drops of octanoic acid are placed on the surface of a dish of water and a dish of 0.1 M NaOH.
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Narrative
Ionization of carboxylic acids is shown by comparing the action of octanoic acid on water and sodium hydroxide solution. The base reacts with octanoic acid to form a sodium salt. Salts of long chain carboxylic acids are soaps.

Discussion
Ionization of carboxylic acids is shown by comparing the action of octanoic acid drops on water and 0.1M NaOH. The base reacts with octanoic acid to form a sodium salt (a soap).

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