REACTIONS AND IDENTIFICATION 365 1. Action of silver nitrate. Acidify 2 ml. of aqueous AgNO 3 solution with dil. HNO 3 and add the acid chloride drop by drop with shaking. Acetyl chloride and benzoyl chloride give a precipitate of AgCl. Filter, wash with water, and then with methylated spirit to remove any benzoic acid: the AgCl remains. 2. Hydrolysis. If the substance is a liquid, add i ml. very carefully to 5 ml. of distilled water: (a) Acetyl chloride reacts almost immediately with the evolution of HCl and of heat. Cool, and to one portion of the solution add dil. HNO 3 and then aqueous AgNO 3 solution: a copious precipitate of AgCl is formed. Test the remainder of the solution for acetic acid (p. 347). ( b ) Acetic anhydride is almost insoluble in water. Warm the mixture gently and note that a completely homogeneous solution is rapidly ob-tained. No precipitate is obtained with dil. HNO 3 and AgNO 3 . Carry out tests for acetic acid (p. 347). (c)
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