Boil 0.5 g of the powdered tablets for 2 to 3 minutes with 10 mL of 5 M sodium hydroxide,

cool and add an excess of 1 M sulfuric acid; a crystalline precipitate is produced. To a solution of the precipitate in water add iron (III) chloride solution R1; a _______ colour is produced.

A、turquoise blue

B、deep violet

C、sandybrown

D、smoky grey

提问人：网友secker 发布时间：2022-01-07

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