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The image below shows the effect of acid...

The image below shows the effect of acid and base on the aqueous ethylamine.

(a) What evidence is there for a chemical reaction between ethylamine and hydrochloric acid?
(b) Why does the smell of ethylamine disappear when hydrochloric acid is added?
(c) Why does the smell of ethylamine reappear when sodium hydroxide is added?

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