The apparatus shown in the figure below was used in a series of experiments. A c

Question

The apparatus shown in the figure below was used in a series of experiments. A cotton ball soaked in either hydrochloric acid (HCI) or acetic acid (CH_3COOH) was placed at one end. Another cotton ball soaked in one of three amines (a class of nitrogen compounds)- middot [CH_3NH_2, (CH_3)_2NH, or (CH_3)_3N) was placed on the other end (see figure below). In one combination of acid and amine, a white ring was observed almost exactly halfway between the two ends. Which acid and which amine were used? HCI CH_3COOH CH_3NH_2 (CH_3)_2NH (CH_3)_3N

Explanation / Answer

a. HCl and (CH3)2NH may be used, HCl is strong acid and (CH3)2NH is also strong base among the three.

so that it gives white precipitate at the middle.

    (CH3)2NH + HCl ------> (CH3)2NH2^+Cl-

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